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hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
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-rw-r--r--src/data/cacheable-object.js10
-rw-r--r--src/data/checks.js186
-rw-r--r--src/data/composite/control-flow/flipFilter.js36
-rw-r--r--src/data/composite/control-flow/index.js1
-rw-r--r--src/data/composite/control-flow/withAvailabilityFilter.js1
-rw-r--r--src/data/composite/data/index.js1
-rw-r--r--src/data/composite/data/withFilteredList.js16
-rw-r--r--src/data/composite/data/withLengthOfList.js54
-rw-r--r--src/data/composite/data/withNearbyItemFromList.js52
-rw-r--r--src/data/composite/data/withPropertyFromList.js22
-rw-r--r--src/data/composite/data/withPropertyFromObject.js38
-rw-r--r--src/data/composite/things/album/index.js1
-rw-r--r--src/data/composite/things/album/withHasCoverArt.js64
-rw-r--r--src/data/composite/things/artwork/index.js5
-rw-r--r--src/data/composite/things/artwork/withAttachedArtwork.js43
-rw-r--r--src/data/composite/things/artwork/withContainingArtworkList.js46
-rw-r--r--src/data/composite/things/artwork/withContribsFromAttachedArtwork.js27
-rw-r--r--src/data/composite/things/artwork/withDate.js41
-rw-r--r--src/data/composite/things/artwork/withPropertyFromAttachedArtwork.js65
-rw-r--r--src/data/composite/things/content/contentArtists.js40
-rw-r--r--src/data/composite/things/content/hasAnnotationPart.js25
-rw-r--r--src/data/composite/things/content/helpers/withExpressedOrImplicitArtistReferences.js60
-rw-r--r--src/data/composite/things/content/index.js7
-rw-r--r--src/data/composite/things/content/withAnnotationParts.js93
-rw-r--r--src/data/composite/things/content/withHasAnnotationPart.js43
-rw-r--r--src/data/composite/things/content/withSourceText.js53
-rw-r--r--src/data/composite/things/content/withSourceURLs.js62
-rw-r--r--src/data/composite/things/content/withWebArchiveDate.js41
-rw-r--r--src/data/composite/things/contribution/thingPropertyMatches.js18
-rw-r--r--src/data/composite/things/contribution/thingReferenceTypeMatches.js29
-rw-r--r--src/data/composite/things/track-section/withContinueCountingFrom.js2
-rw-r--r--src/data/composite/things/track/index.js2
-rw-r--r--src/data/composite/things/track/trackAdditionalNameList.js38
-rw-r--r--src/data/composite/things/track/withAlbum.js22
-rw-r--r--src/data/composite/things/track/withAllReleases.js1
-rw-r--r--src/data/composite/things/track/withAlwaysReferenceByDirectory.js16
-rw-r--r--src/data/composite/things/track/withCoverArtistContribs.js73
-rw-r--r--src/data/composite/things/track/withHasUniqueCoverArt.js76
-rw-r--r--src/data/composite/things/track/withOtherReleases.js3
-rw-r--r--src/data/composite/things/track/withPropertyFromAlbum.js17
-rw-r--r--src/data/composite/things/track/withTrackArtDate.js24
-rw-r--r--src/data/composite/wiki-data/index.js5
-rw-r--r--src/data/composite/wiki-data/splitContentNodesAround.js87
-rw-r--r--src/data/composite/wiki-data/withConstitutedArtwork.js60
-rw-r--r--src/data/composite/wiki-data/withContentNodes.js25
-rw-r--r--src/data/composite/wiki-data/withCoverArtDate.js23
-rw-r--r--src/data/composite/wiki-data/withParsedCommentaryEntries.js260
-rw-r--r--src/data/composite/wiki-data/withResolvedAnnotatedReferenceList.js18
-rw-r--r--src/data/composite/wiki-data/withResolvedSeriesList.js130
-rw-r--r--src/data/composite/wiki-properties/additionalFiles.js30
-rw-r--r--src/data/composite/wiki-properties/additionalNameList.js14
-rw-r--r--src/data/composite/wiki-properties/annotatedReferenceList.js8
-rw-r--r--src/data/composite/wiki-properties/commentary.js30
-rw-r--r--src/data/composite/wiki-properties/commentatorArtists.js11
-rw-r--r--src/data/composite/wiki-properties/constitutibleArtwork.js70
-rw-r--r--src/data/composite/wiki-properties/constitutibleArtworkList.js72
-rw-r--r--src/data/composite/wiki-properties/directory.js1
-rw-r--r--src/data/composite/wiki-properties/index.js6
-rw-r--r--src/data/composite/wiki-properties/referencedArtworkList.js37
-rw-r--r--src/data/composite/wiki-properties/seriesList.js31
-rw-r--r--src/data/composite/wiki-properties/soupyReverse.js15
-rw-r--r--src/data/thing.js12
-rw-r--r--src/data/things/additional-file.js47
-rw-r--r--src/data/things/additional-name.js21
-rw-r--r--src/data/things/album.js362
-rw-r--r--src/data/things/art-tag.js35
-rw-r--r--src/data/things/artist.js45
-rw-r--r--src/data/things/artwork.js510
-rw-r--r--src/data/things/content.js205
-rw-r--r--src/data/things/contribution.js82
-rw-r--r--src/data/things/flash.js82
-rw-r--r--src/data/things/group.js89
-rw-r--r--src/data/things/homepage-layout.js3
-rw-r--r--src/data/things/index.js8
-rw-r--r--src/data/things/language.js55
-rw-r--r--src/data/things/sorting-rule.js1
-rw-r--r--src/data/things/track.js305
-rw-r--r--src/data/things/wiki-info.js37
-rw-r--r--src/data/yaml.js416
79 files changed, 3595 insertions, 1107 deletions
diff --git a/src/data/cacheable-object.js b/src/data/cacheable-object.js
index 087f7825..651a61cf 100644
--- a/src/data/cacheable-object.js
+++ b/src/data/cacheable-object.js
@@ -14,7 +14,7 @@ export default class CacheableObject {
   static cacheValid = Symbol.for('CacheableObject.cacheValid');
   static updateValue = Symbol.for('CacheableObject.updateValues');
 
-  constructor() {
+  constructor({seal = true} = {}) {
     this[CacheableObject.updateValue] = Object.create(null);
     this[CacheableObject.cachedValue] = Object.create(null);
     this[CacheableObject.cacheValid] = Object.create(null);
@@ -34,6 +34,10 @@ export default class CacheableObject {
         this[property] = null;
       }
     }
+
+    if (seal) {
+      Object.seal(this);
+    }
   }
 
   static finalizeCacheableObjectPrototype() {
@@ -239,13 +243,13 @@ export class CacheableObjectPropertyValueError extends Error {
 
     try {
       inspectOldValue = inspect(oldValue);
-    } catch (error) {
+    } catch {
       inspectOldValue = colors.red(`(couldn't inspect)`);
     }
 
     try {
       inspectNewValue = inspect(newValue);
-    } catch (error) {
+    } catch {
       inspectNewValue = colors.red(`(couldn't inspect)`);
     }
 
diff --git a/src/data/checks.js b/src/data/checks.js
index 10261e4f..3fcb6d3b 100644
--- a/src/data/checks.js
+++ b/src/data/checks.js
@@ -4,12 +4,11 @@ import {inspect as nodeInspect} from 'node:util';
 import {colors, ENABLE_COLOR} from '#cli';
 
 import CacheableObject from '#cacheable-object';
-import {replacerSpec, parseInput} from '#replacer';
+import {replacerSpec, parseContentNodes} from '#replacer';
 import {compareArrays, cut, cutStart, empty, getNestedProp, iterateMultiline}
   from '#sugar';
 import Thing from '#thing';
 import thingConstructors from '#things';
-import {combineWikiDataArrays, commentaryRegexCaseSensitive} from '#wiki-data';
 
 import {
   annotateErrorWithIndex,
@@ -50,7 +49,7 @@ export function reportDirectoryErrors(wikiData, {
     if (!thingData) continue;
 
     for (const thing of thingData) {
-      if (findSpec.include && !findSpec.include(thing)) {
+      if (findSpec.include && !findSpec.include(thing, thingConstructors)) {
         continue;
       }
 
@@ -185,15 +184,21 @@ export function filterReferenceErrors(wikiData, {
       groups: 'group',
       artTags: '_artTag',
       referencedArtworks: '_artwork',
-      commentary: '_commentary',
+      commentary: '_content',
+      creditingSources: '_content',
     }],
 
     ['artTagData', {
       directDescendantArtTags: 'artTag',
     }],
 
+    ['artworkData', {
+      referencedArtworks: '_artwork',
+    }],
+
     ['flashData', {
-      commentary: '_commentary',
+      commentary: '_content',
+      creditingSources: '_content',
     }],
 
     ['groupCategoryData', {
@@ -220,8 +225,8 @@ export function filterReferenceErrors(wikiData, {
       flashes: 'flash',
     }],
 
-    ['groupData', {
-      serieses: '_serieses',
+    ['seriesData', {
+      albums: 'album',
     }],
 
     ['trackData', {
@@ -233,7 +238,10 @@ export function filterReferenceErrors(wikiData, {
       artTags: '_artTag',
       referencedArtworks: '_artwork',
       mainReleaseTrack: '_trackMainReleasesOnly',
-      commentary: '_commentary',
+      commentary: '_content',
+      creditingSources: '_content',
+      referencingSources: '_content',
+      lyrics: '_content',
     }],
 
     ['wikiInfo', {
@@ -268,12 +276,12 @@ export function filterReferenceErrors(wikiData, {
             let writeProperty = true;
 
             switch (findFnKey) {
-              case '_commentary':
+              case '_content':
                 if (value) {
                   value =
-                    Array.from(value.matchAll(commentaryRegexCaseSensitive))
-                      .map(({groups}) => groups.artistReferences)
-                      .map(text => text.split(',').map(text => text.trim()));
+                    value.map(entry =>
+                      CacheableObject.getUpdateValue(entry, 'artists') ??
+                      []);
                 }
 
                 writeProperty = false;
@@ -287,15 +295,6 @@ export function filterReferenceErrors(wikiData, {
                 // need writing, humm...)
                 writeProperty = false;
                 break;
-
-              case '_serieses':
-                if (value) {
-                  // Doesn't report on which series has the error, but...
-                  value = value.flatMap(series => series.albums);
-                }
-
-                writeProperty = false;
-                break;
             }
 
             if (value === undefined) {
@@ -313,15 +312,12 @@ export function filterReferenceErrors(wikiData, {
               case '_artwork': {
                 const mixed =
                   find.mixed({
-                    album: find.albumWithArtwork,
-                    track: find.trackWithArtwork,
+                    album: find.albumPrimaryArtwork,
+                    track: find.trackPrimaryArtwork,
                   });
 
                 const data =
-                  combineWikiDataArrays([
-                    wikiData.albumData,
-                    wikiData.trackData,
-                  ]);
+                  wikiData.artworkData;
 
                 findFn = ref => mixed(ref.reference, data, {mode: 'error'});
 
@@ -332,7 +328,7 @@ export function filterReferenceErrors(wikiData, {
                 findFn = boundFind.artTag;
                 break;
 
-              case '_commentary':
+              case '_content':
                 findFn = findArtistOrAlias;
                 break;
 
@@ -350,10 +346,6 @@ export function filterReferenceErrors(wikiData, {
                 };
                 break;
 
-              case '_serieses':
-                findFn = boundFind.album;
-                break;
-
               case '_trackArtwork':
                 findFn = ref => boundFind.track(ref.reference);
                 break;
@@ -393,7 +385,7 @@ export function filterReferenceErrors(wikiData, {
                 break;
             }
 
-            const suppress = fn => conditionallySuppressError(error => {
+            const suppress = fn => conditionallySuppressError(_error => {
               // We're not suppressing any errors at the moment.
               // An old suppression is kept below for reference.
 
@@ -464,7 +456,7 @@ export function filterReferenceErrors(wikiData, {
                 }
               }
 
-              if (findFnKey === '_commentary') {
+              if (findFnKey === '_content') {
                 filter(
                   value, {message: errorMessage},
                   decorateErrorWithIndex(refs =>
@@ -565,16 +557,29 @@ export function reportContentTextErrors(wikiData, {
     description: 'description',
   };
 
+  const artworkShape = {
+    source: 'artwork source',
+    originDetails: 'artwork origin details',
+  };
+
   const commentaryShape = {
     body: 'commentary body',
-    artistDisplayText: 'commentary artist display text',
+    artistText: 'commentary artist text',
     annotation: 'commentary annotation',
   };
 
+  const lyricsShape = {
+    body: 'lyrics body',
+    artistText: 'lyrics artist text',
+    annotation: 'lyrics annotation',
+  };
+
   const contentTextSpec = [
     ['albumData', {
       additionalFiles: additionalFileShape,
       commentary: commentaryShape,
+      creditingSources: commentaryShape,
+      coverArtworks: artworkShape,
     }],
 
     ['artTagData', {
@@ -587,6 +592,8 @@ export function reportContentTextErrors(wikiData, {
 
     ['flashData', {
       commentary: commentaryShape,
+      creditingSources: commentaryShape,
+      coverArtwork: artworkShape,
     }],
 
     ['flashActData', {
@@ -616,10 +623,12 @@ export function reportContentTextErrors(wikiData, {
     ['trackData', {
       additionalFiles: additionalFileShape,
       commentary: commentaryShape,
-      creditSources: commentaryShape,
-      lyrics: '_content',
+      creditingSources: commentaryShape,
+      referencingSources: commentaryShape,
+      lyrics: lyricsShape,
       midiProjectFiles: additionalFileShape,
       sheetMusicFiles: additionalFileShape,
+      trackArtworks: artworkShape,
     }],
 
     ['wikiInfo', {
@@ -632,7 +641,7 @@ export function reportContentTextErrors(wikiData, {
   const findArtistOrAlias = bindFindArtistOrAlias(boundFind);
 
   function* processContent(input) {
-    const nodes = parseInput(input);
+    const nodes = parseContentNodes(input);
 
     for (const node of nodes) {
       const index = node.i;
@@ -689,7 +698,7 @@ export function reportContentTextErrors(wikiData, {
       } else if (node.type === 'external-link') {
         try {
           new URL(node.data.href);
-        } catch (error) {
+        } catch {
           yield {
             index, length,
             message:
@@ -740,8 +749,8 @@ export function reportContentTextErrors(wikiData, {
         for (const thing of things) {
           nest({message: `Content text errors in ${inspect(thing)}`}, ({nest, push}) => {
 
-            for (const [property, shape] of Object.entries(propSpec)) {
-              const value = thing[property];
+            for (let [property, shape] of Object.entries(propSpec)) {
+              let value = thing[property];
 
               if (value === undefined) {
                 push(new TypeError(`Property ${colors.red(property)} isn't valid for ${colors.green(thing.constructor.name)}`));
@@ -760,6 +769,31 @@ export function reportContentTextErrors(wikiData, {
               const topMessage =
                 `Content text errors` + fieldPropertyMessage;
 
+              const checkShapeEntries = (entry, callProcessContentOpts) => {
+                for (const [key, annotation] of Object.entries(shape)) {
+                  const value = entry[key];
+
+                  // TODO: This should be an undefined/null check, like above,
+                  // but it's not, because sometimes the stuff we're checking
+                  // here isn't actually coded as a Thing - so the properties
+                  // might really be undefined instead of null. Terrifying and
+                  // awful. And most of all, citation needed.
+                  if (!value) continue;
+
+                  callProcessContent({
+                    ...callProcessContentOpts,
+
+                    // TODO: `nest` isn't provided by `callProcessContentOpts`
+                    //`but `push` is - this is to match the old code, but
+                    // what's the deal here?
+                    nest,
+
+                    value,
+                    message: `Error in ${colors.green(annotation)}`,
+                  });
+                }
+              };
+
               if (shape === '_content') {
                 callProcessContent({
                   nest,
@@ -767,26 +801,18 @@ export function reportContentTextErrors(wikiData, {
                   value,
                   message: topMessage,
                 });
-              } else {
+              } else if (Array.isArray(value)) {
                 nest({message: topMessage}, ({push}) => {
                   for (const [index, entry] of value.entries()) {
-                    for (const [key, annotation] of Object.entries(shape)) {
-                      const value = entry[key];
-
-                      // TODO: Should this check undefined/null similar to above?
-                      if (!value) continue;
-
-                      callProcessContent({
-                        nest,
-                        push,
-                        value,
-                        message: `Error in ${colors.green(annotation)}`,
-                        annotateError: error =>
-                          annotateErrorWithIndex(error, index),
-                      });
-                    }
+                    checkShapeEntries(entry, {
+                      push,
+                      annotateError: error =>
+                        annotateErrorWithIndex(error, index),
+                    });
                   }
                 });
+              } else {
+                checkShapeEntries(value, {push});
               }
             }
           });
@@ -795,3 +821,49 @@ export function reportContentTextErrors(wikiData, {
     }
   });
 }
+
+export function reportOrphanedArtworks(wikiData) {
+  const aggregate =
+    openAggregate({message: `Artwork objects are orphaned`});
+
+  const assess = ({
+    message,
+    filterThing,
+    filterContribs,
+    link,
+  }) => {
+    aggregate.nest({message: `Orphaned ${message}`}, ({push}) => {
+      const ostensibleArtworks =
+        wikiData.artworkData
+          .filter(artwork =>
+            artwork.thing instanceof filterThing &&
+            artwork.artistContribsFromThingProperty === filterContribs);
+
+      const orphanedArtworks =
+        ostensibleArtworks
+          .filter(artwork => !artwork.thing[link].includes(artwork));
+
+      for (const artwork of orphanedArtworks) {
+        push(new Error(`Orphaned: ${inspect(artwork)}`));
+      }
+    });
+  };
+
+  const {Album, Track} = thingConstructors;
+
+  assess({
+    message: `album cover artworks`,
+    filterThing: Album,
+    filterContribs: 'coverArtistContribs',
+    link: 'coverArtworks',
+  });
+
+  assess({
+    message: `track artworks`,
+    filterThing: Track,
+    filterContribs: 'coverArtistContribs',
+    link: 'trackArtworks',
+  });
+
+  aggregate.close();
+}
diff --git a/src/data/composite/control-flow/flipFilter.js b/src/data/composite/control-flow/flipFilter.js
new file mode 100644
index 00000000..995bacad
--- /dev/null
+++ b/src/data/composite/control-flow/flipFilter.js
@@ -0,0 +1,36 @@
+// Flips a filter, so that each true item becomes false, and vice versa.
+// Overwrites the provided dependency.
+//
+// See also:
+//  - withAvailabilityFilter
+
+import {input, templateCompositeFrom} from '#composite';
+
+export default templateCompositeFrom({
+  annotation: `flipFilter`,
+
+  inputs: {
+    filter: input({type: 'array'}),
+  },
+
+  outputs: ({
+    [input.staticDependency('filter')]: filterDependency,
+  }) => [filterDependency ?? '#flippedFilter'],
+
+  steps: () => [
+    {
+      dependencies: [
+        input('filter'),
+        input.staticDependency('filter'),
+      ],
+
+      compute: (continuation, {
+        [input('filter')]: filter,
+        [input.staticDependency('filter')]: filterDependency,
+      }) => continuation({
+        [filterDependency ?? '#flippedFilter']:
+          filter.map(item => !item),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/control-flow/index.js b/src/data/composite/control-flow/index.js
index 7e137a14..778dc66b 100644
--- a/src/data/composite/control-flow/index.js
+++ b/src/data/composite/control-flow/index.js
@@ -10,6 +10,7 @@ export {default as exposeDependency} from './exposeDependency.js';
 export {default as exposeDependencyOrContinue} from './exposeDependencyOrContinue.js';
 export {default as exposeUpdateValueOrContinue} from './exposeUpdateValueOrContinue.js';
 export {default as exposeWhetherDependencyAvailable} from './exposeWhetherDependencyAvailable.js';
+export {default as flipFilter} from './flipFilter.js';
 export {default as raiseOutputWithoutDependency} from './raiseOutputWithoutDependency.js';
 export {default as raiseOutputWithoutUpdateValue} from './raiseOutputWithoutUpdateValue.js';
 export {default as withAvailabilityFilter} from './withAvailabilityFilter.js';
diff --git a/src/data/composite/control-flow/withAvailabilityFilter.js b/src/data/composite/control-flow/withAvailabilityFilter.js
index cfea998e..fd93af71 100644
--- a/src/data/composite/control-flow/withAvailabilityFilter.js
+++ b/src/data/composite/control-flow/withAvailabilityFilter.js
@@ -4,6 +4,7 @@
 // Accepts the same mode options as withResultOfAvailabilityCheck.
 //
 // See also:
+//  - flipFilter
 //  - withFilteredList
 //  - withResultOfAvailabilityCheck
 //
diff --git a/src/data/composite/data/index.js b/src/data/composite/data/index.js
index 46a3dc81..05b59445 100644
--- a/src/data/composite/data/index.js
+++ b/src/data/composite/data/index.js
@@ -20,6 +20,7 @@ export {default as withMappedList} from './withMappedList.js';
 export {default as withSortedList} from './withSortedList.js';
 export {default as withStretchedList} from './withStretchedList.js';
 
+export {default as withLengthOfList} from './withLengthOfList.js';
 export {default as withPropertyFromList} from './withPropertyFromList.js';
 export {default as withPropertiesFromList} from './withPropertiesFromList.js';
 
diff --git a/src/data/composite/data/withFilteredList.js b/src/data/composite/data/withFilteredList.js
index 44c1661d..15ee3373 100644
--- a/src/data/composite/data/withFilteredList.js
+++ b/src/data/composite/data/withFilteredList.js
@@ -2,9 +2,6 @@
 // corresponding items in a list. Items which correspond to a truthy value
 // are kept, and the rest are excluded from the output list.
 //
-// If the flip option is set, only items corresponding with a *falsy* value in
-// the filter are kept.
-//
 // TODO: There should be two outputs - one for the items included according to
 // the filter, and one for the items excluded.
 //
@@ -22,28 +19,19 @@ export default templateCompositeFrom({
   inputs: {
     list: input({type: 'array'}),
     filter: input({type: 'array'}),
-
-    flip: input({
-      type: 'boolean',
-      defaultValue: false,
-    }),
   },
 
   outputs: ['#filteredList'],
 
   steps: () => [
     {
-      dependencies: [input('list'), input('filter'), input('flip')],
+      dependencies: [input('list'), input('filter')],
       compute: (continuation, {
         [input('list')]: list,
         [input('filter')]: filter,
-        [input('flip')]: flip,
       }) => continuation({
         '#filteredList':
-          list.filter((_item, index) =>
-            (flip
-              ? !filter[index]
-              :  filter[index])),
+          list.filter((_item, index) => filter[index]),
       }),
     },
   ],
diff --git a/src/data/composite/data/withLengthOfList.js b/src/data/composite/data/withLengthOfList.js
new file mode 100644
index 00000000..e67aa887
--- /dev/null
+++ b/src/data/composite/data/withLengthOfList.js
@@ -0,0 +1,54 @@
+import {input, templateCompositeFrom} from '#composite';
+
+function getOutputName({
+  [input.staticDependency('list')]: list,
+}) {
+  if (list && list.startsWith('#')) {
+    return `${list}.length`;
+  } else if (list) {
+    return `#${list}.length`;
+  } else {
+    return '#length';
+  }
+}
+
+export default templateCompositeFrom({
+  annotation: `withMappedList`,
+
+  inputs: {
+    list: input({type: 'array'}),
+  },
+
+  outputs: inputs => [getOutputName(inputs)],
+
+  steps: () => [
+    {
+      dependencies: [input.staticDependency('list')],
+      compute: (continuation, inputs) =>
+        continuation({'#output': getOutputName(inputs)}),
+    },
+
+    {
+      dependencies: [input('list')],
+      compute: (continuation, {
+        [input('list')]: list,
+      }) => continuation({
+        ['#value']:
+          (list === null
+            ? null
+            : list.length),
+      }),
+    },
+
+    {
+      dependencies: ['#output', '#value'],
+
+      compute: (continuation, {
+        ['#output']: output,
+        ['#value']: value,
+      }) => continuation({
+        [output]: value,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/data/withNearbyItemFromList.js b/src/data/composite/data/withNearbyItemFromList.js
index 83a8cc21..5e165219 100644
--- a/src/data/composite/data/withNearbyItemFromList.js
+++ b/src/data/composite/data/withNearbyItemFromList.js
@@ -9,6 +9,10 @@
 //  - If the 'valuePastEdge' input is provided, that value will be output
 //    instead of null.
 //
+//  - If the 'filter' input is provided, corresponding items will be skipped,
+//    and only (repeating `offset`) the next included in the filter will be
+//    returned.
+//
 // Both the list and item must be provided.
 //
 // See also:
@@ -16,7 +20,6 @@
 //
 
 import {input, templateCompositeFrom} from '#composite';
-import {atOffset} from '#sugar';
 
 import {raiseOutputWithoutDependency} from '#composite/control-flow';
 
@@ -28,9 +31,12 @@ export default templateCompositeFrom({
   inputs: {
     list: input({acceptsNull: false, type: 'array'}),
     item: input({acceptsNull: false}),
-
     offset: input({type: 'number'}),
+
     wrap: input({type: 'boolean', defaultValue: false}),
+    valuePastEdge: input({defaultValue: null}),
+
+    filter: input({defaultValue: null, type: 'array'}),
   },
 
   outputs: ['#nearbyItem'],
@@ -45,29 +51,55 @@ export default templateCompositeFrom({
       dependency: '#index',
       mode: input.value('index'),
 
-      output: input.value({
-        ['#nearbyItem']:
-          null,
-      }),
+      output: input.value({'#nearbyItem': null}),
     }),
 
     {
       dependencies: [
         input('list'),
         input('offset'),
+
         input('wrap'),
+        input('valuePastEdge'),
+
+        input('filter'),
+
         '#index',
       ],
 
       compute: (continuation, {
         [input('list')]: list,
         [input('offset')]: offset,
+
         [input('wrap')]: wrap,
+        [input('valuePastEdge')]: valuePastEdge,
+
+        [input('filter')]: filter,
+
         ['#index']: index,
-      }) => continuation({
-        ['#nearbyItem']:
-          atOffset(list, index, offset, {wrap}),
-      }),
+      }) => {
+        const startIndex = index;
+
+        do {
+          index += offset;
+
+          if (wrap) {
+            index = index % list.length;
+          } else if (index < 0) {
+            return continuation({'#nearbyItem': valuePastEdge});
+          } else if (index >= list.length) {
+            return continuation({'#nearbyItem': valuePastEdge});
+          }
+
+          if (filter && !filter[index]) {
+            continue;
+          }
+
+          return continuation({'#nearbyItem': list[index]});
+        } while (index !== startIndex);
+
+        return continuation({'#nearbyItem': null});
+      },
     },
   ],
 });
diff --git a/src/data/composite/data/withPropertyFromList.js b/src/data/composite/data/withPropertyFromList.js
index 65ebf77b..760095c2 100644
--- a/src/data/composite/data/withPropertyFromList.js
+++ b/src/data/composite/data/withPropertyFromList.js
@@ -5,11 +5,15 @@
 // original list are kept null here. Objects which don't have the specified
 // property are retained in-place as null.
 //
+// If the `internal` input is true, this reads the CacheableObject update value
+// of each object rather than its exposed value.
+//
 // See also:
 //  - withPropertiesFromList
 //  - withPropertyFromObject
 //
 
+import CacheableObject from '#cacheable-object';
 import {input, templateCompositeFrom} from '#composite';
 
 function getOutputName({list, property, prefix}) {
@@ -26,6 +30,7 @@ export default templateCompositeFrom({
     list: input({type: 'array'}),
     property: input({type: 'string'}),
     prefix: input.staticValue({type: 'string', defaultValue: null}),
+    internal: input({type: 'boolean', defaultValue: false}),
   },
 
   outputs: ({
@@ -37,13 +42,26 @@ export default templateCompositeFrom({
 
   steps: () => [
     {
-      dependencies: [input('list'), input('property')],
+      dependencies: [
+        input('list'),
+        input('property'),
+        input('internal'),
+      ],
+
       compute: (continuation, {
         [input('list')]: list,
         [input('property')]: property,
+        [input('internal')]: internal,
       }) => continuation({
         ['#values']:
-          list.map(item => item[property] ?? null),
+          list.map(item =>
+            (item === null
+              ? null
+           : internal
+              ? CacheableObject.getUpdateValue(item, property)
+                  ?? null
+              : item[property]
+                  ?? null)),
       }),
     },
 
diff --git a/src/data/composite/data/withPropertyFromObject.js b/src/data/composite/data/withPropertyFromObject.js
index 4f240506..7b452b99 100644
--- a/src/data/composite/data/withPropertyFromObject.js
+++ b/src/data/composite/data/withPropertyFromObject.js
@@ -13,6 +13,21 @@
 import CacheableObject from '#cacheable-object';
 import {input, templateCompositeFrom} from '#composite';
 
+function getOutputName({
+  [input.staticDependency('object')]: object,
+  [input.staticValue('property')]: property,
+}) {
+  if (object && property) {
+    if (object.startsWith('#')) {
+      return `${object}.${property}`;
+    } else {
+      return `#${object}.${property}`;
+    }
+  } else {
+    return '#value';
+  }
+}
+
 export default templateCompositeFrom({
   annotation: `withPropertyFromObject`,
 
@@ -22,15 +37,7 @@ export default templateCompositeFrom({
     internal: input({type: 'boolean', defaultValue: false}),
   },
 
-  outputs: ({
-    [input.staticDependency('object')]: object,
-    [input.staticValue('property')]: property,
-  }) =>
-    (object && property
-      ? (object.startsWith('#')
-          ? [`${object}.${property}`]
-          : [`#${object}.${property}`])
-      : ['#value']),
+  outputs: inputs => [getOutputName(inputs)],
 
   steps: () => [
     {
@@ -39,17 +46,8 @@ export default templateCompositeFrom({
         input.staticValue('property'),
       ],
 
-      compute: (continuation, {
-        [input.staticDependency('object')]: object,
-        [input.staticValue('property')]: property,
-      }) => continuation({
-        '#output':
-          (object && property
-            ? (object.startsWith('#')
-                ? `${object}.${property}`
-                : `#${object}.${property}`)
-            : '#value'),
-      }),
+      compute: (continuation, inputs) =>
+        continuation({'#output': getOutputName(inputs)}),
     },
 
     {
diff --git a/src/data/composite/things/album/index.js b/src/data/composite/things/album/index.js
index 8b5098f0..dfc6864f 100644
--- a/src/data/composite/things/album/index.js
+++ b/src/data/composite/things/album/index.js
@@ -1 +1,2 @@
+export {default as withHasCoverArt} from './withHasCoverArt.js';
 export {default as withTracks} from './withTracks.js';
diff --git a/src/data/composite/things/album/withHasCoverArt.js b/src/data/composite/things/album/withHasCoverArt.js
new file mode 100644
index 00000000..fd3f2894
--- /dev/null
+++ b/src/data/composite/things/album/withHasCoverArt.js
@@ -0,0 +1,64 @@
+// TODO: This shouldn't be coded as an Album-specific thing,
+// or even really to do with cover artworks in particular, either.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency, withResultOfAvailabilityCheck}
+  from '#composite/control-flow';
+import {fillMissingListItems, withFlattenedList, withPropertyFromList}
+  from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: 'withHasCoverArt',
+
+  outputs: ['#hasCoverArt'],
+
+  steps: () => [
+    withResultOfAvailabilityCheck({
+      from: 'coverArtistContribs',
+      mode: input.value('empty'),
+    }),
+
+    {
+      dependencies: ['#availability'],
+      compute: (continuation, {
+        ['#availability']: availability,
+      }) =>
+        (availability
+          ? continuation.raiseOutput({
+              ['#hasCoverArt']: true,
+            })
+          : continuation()),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: 'coverArtworks',
+      mode: input.value('empty'),
+      output: input.value({'#hasCoverArt': false}),
+    }),
+
+    withPropertyFromList({
+      list: 'coverArtworks',
+      property: input.value('artistContribs'),
+      internal: input.value(true),
+    }),
+
+    // Since we're getting the update value for each artwork's artistContribs,
+    // it may not be set at all, and in that case won't be exposing as [].
+    fillMissingListItems({
+      list: '#coverArtworks.artistContribs',
+      fill: input.value([]),
+    }),
+
+    withFlattenedList({
+      list: '#coverArtworks.artistContribs',
+    }),
+
+    withResultOfAvailabilityCheck({
+      from: '#flattenedList',
+      mode: input.value('empty'),
+    }).outputs({
+      '#availability': '#hasCoverArt',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/artwork/index.js b/src/data/composite/things/artwork/index.js
new file mode 100644
index 00000000..3693c10f
--- /dev/null
+++ b/src/data/composite/things/artwork/index.js
@@ -0,0 +1,5 @@
+export {default as withAttachedArtwork} from './withAttachedArtwork.js';
+export {default as withContainingArtworkList} from './withContainingArtworkList.js';
+export {default as withContribsFromAttachedArtwork} from './withContribsFromAttachedArtwork.js';
+export {default as withDate} from './withDate.js';
+export {default as withPropertyFromAttachedArtwork} from './withPropertyFromAttachedArtwork.js';
diff --git a/src/data/composite/things/artwork/withAttachedArtwork.js b/src/data/composite/things/artwork/withAttachedArtwork.js
new file mode 100644
index 00000000..d7c0d87b
--- /dev/null
+++ b/src/data/composite/things/artwork/withAttachedArtwork.js
@@ -0,0 +1,43 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {flipFilter, raiseOutputWithoutDependency}
+  from '#composite/control-flow';
+import {withNearbyItemFromList, withPropertyFromList} from '#composite/data';
+
+import withContainingArtworkList from './withContainingArtworkList.js';
+
+export default templateCompositeFrom({
+  annotaion: `withContribsFromMainArtwork`,
+
+  outputs: ['#attachedArtwork'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'attachAbove',
+      mode: input.value('falsy'),
+      output: input.value({'#attachedArtwork': null}),
+    }),
+
+    withContainingArtworkList(),
+
+    withPropertyFromList({
+      list: '#containingArtworkList',
+      property: input.value('attachAbove'),
+    }),
+
+    flipFilter({
+      filter: '#containingArtworkList.attachAbove',
+    }).outputs({
+      '#containingArtworkList.attachAbove': '#filterNotAttached',
+    }),
+
+    withNearbyItemFromList({
+      list: '#containingArtworkList',
+      item: input.myself(),
+      offset: input.value(-1),
+      filter: '#filterNotAttached',
+    }).outputs({
+      '#nearbyItem': '#attachedArtwork',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/artwork/withContainingArtworkList.js b/src/data/composite/things/artwork/withContainingArtworkList.js
new file mode 100644
index 00000000..9c928ffd
--- /dev/null
+++ b/src/data/composite/things/artwork/withContainingArtworkList.js
@@ -0,0 +1,46 @@
+// Gets the list of artworks which contains this one, which is functionally
+// equivalent to `this.thing[this.thingProperty]`. If the exposed value is not
+// a list at all (i.e. the property holds a single artwork), this composition
+// outputs null.
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `withContainingArtworkList`,
+
+  outputs: ['#containingArtworkList'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'thing',
+      output: input.value({'#containingArtworkList': null}),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: 'thingProperty',
+      output: input.value({'#containingArtworkList': null}),
+    }),
+
+    withPropertyFromObject({
+      object: 'thing',
+      property: 'thingProperty',
+    }).outputs({
+      '#value': '#containingValue',
+    }),
+
+    {
+      dependencies: ['#containingValue'],
+      compute: (continuation, {
+        ['#containingValue']: containingValue,
+      }) => continuation({
+        ['#containingArtworkList']:
+          (Array.isArray(containingValue)
+            ? containingValue
+            : null),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/artwork/withContribsFromAttachedArtwork.js b/src/data/composite/things/artwork/withContribsFromAttachedArtwork.js
new file mode 100644
index 00000000..e9425c95
--- /dev/null
+++ b/src/data/composite/things/artwork/withContribsFromAttachedArtwork.js
@@ -0,0 +1,27 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withRecontextualizedContributionList} from '#composite/wiki-data';
+
+import withPropertyFromAttachedArtwork from './withPropertyFromAttachedArtwork.js';
+
+export default templateCompositeFrom({
+  annotaion: `withContribsFromAttachedArtwork`,
+
+  outputs: ['#attachedArtwork.artistContribs'],
+
+  steps: () => [
+    withPropertyFromAttachedArtwork({
+      property: input.value('artistContribs'),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#attachedArtwork.artistContribs',
+      output: input.value({'#attachedArtwork.artistContribs': null}),
+    }),
+
+    withRecontextualizedContributionList({
+      list: '#attachedArtwork.artistContribs',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/artwork/withDate.js b/src/data/composite/things/artwork/withDate.js
new file mode 100644
index 00000000..5e05b814
--- /dev/null
+++ b/src/data/composite/things/artwork/withDate.js
@@ -0,0 +1,41 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `withDate`,
+
+  inputs: {
+    from: input({
+      defaultDependency: 'date',
+      acceptsNull: true,
+    }),
+  },
+
+  outputs: ['#date'],
+
+  steps: () => [
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: date,
+      }) =>
+        (date
+          ? continuation.raiseOutput({'#date': date})
+          : continuation()),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: 'dateFromThingProperty',
+      output: input.value({'#date': null}),
+    }),
+
+    withPropertyFromObject({
+      object: 'thing',
+      property: 'dateFromThingProperty',
+    }).outputs({
+      ['#value']: '#date',
+    }),
+  ],
+})
diff --git a/src/data/composite/things/artwork/withPropertyFromAttachedArtwork.js b/src/data/composite/things/artwork/withPropertyFromAttachedArtwork.js
new file mode 100644
index 00000000..a2f954b9
--- /dev/null
+++ b/src/data/composite/things/artwork/withPropertyFromAttachedArtwork.js
@@ -0,0 +1,65 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {withResultOfAvailabilityCheck} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withAttachedArtwork from './withAttachedArtwork.js';
+
+function getOutputName({
+  [input.staticValue('property')]: property,
+}) {
+  if (property) {
+    return `#attachedArtwork.${property}`;
+  } else {
+    return '#value';
+  }
+}
+
+export default templateCompositeFrom({
+  annotation: `withPropertyFromAttachedArtwork`,
+
+  inputs: {
+    property: input({type: 'string'}),
+  },
+
+  outputs: inputs => [getOutputName(inputs)],
+
+  steps: () => [
+    {
+      dependencies: [input.staticValue('property')],
+      compute: (continuation, inputs) =>
+        continuation({'#output': getOutputName(inputs)}),
+    },
+
+    withAttachedArtwork(),
+
+    withResultOfAvailabilityCheck({
+      from: '#attachedArtwork',
+    }),
+
+    {
+      dependencies: ['#availability', '#output'],
+      compute: (continuation, {
+        ['#availability']: availability,
+        ['#output']: output,
+      }) =>
+        (availability
+          ? continuation()
+          : continuation.raiseOutput({[output]: null})),
+    },
+
+    withPropertyFromObject({
+      object: '#attachedArtwork',
+      property: input('property'),
+    }),
+
+    {
+      dependencies: ['#value', '#output'],
+      compute: (continuation, {
+        ['#value']: value,
+        ['#output']: output,
+      }) =>
+        continuation.raiseOutput({[output]: value}),
+    },
+  ],
+});
diff --git a/src/data/composite/things/content/contentArtists.js b/src/data/composite/things/content/contentArtists.js
new file mode 100644
index 00000000..8d5db5a5
--- /dev/null
+++ b/src/data/composite/things/content/contentArtists.js
@@ -0,0 +1,40 @@
+import {input, templateCompositeFrom} from '#composite';
+import {validateReferenceList} from '#validators';
+
+import {exitWithoutDependency, exposeDependency}
+  from '#composite/control-flow';
+import {withResolvedReferenceList} from '#composite/wiki-data';
+import {soupyFind} from '#composite/wiki-properties';
+
+import withExpressedOrImplicitArtistReferences
+  from './helpers/withExpressedOrImplicitArtistReferences.js';
+
+export default templateCompositeFrom({
+  annotation: `contentArtists`,
+
+  compose: false,
+
+  update: {
+    validate: validateReferenceList('artist'),
+  },
+
+  steps: () => [
+    withExpressedOrImplicitArtistReferences({
+      from: input.updateValue(),
+    }),
+
+    exitWithoutDependency({
+      dependency: '#artistReferences',
+      value: input.value([]),
+    }),
+
+    withResolvedReferenceList({
+      list: '#artistReferences',
+      find: soupyFind.input('artist'),
+    }),
+
+    exposeDependency({
+      dependency: '#resolvedReferenceList',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/content/hasAnnotationPart.js b/src/data/composite/things/content/hasAnnotationPart.js
new file mode 100644
index 00000000..83d175e3
--- /dev/null
+++ b/src/data/composite/things/content/hasAnnotationPart.js
@@ -0,0 +1,25 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {exposeDependency} from '#composite/control-flow';
+
+import withHasAnnotationPart from './withHasAnnotationPart.js';
+
+export default templateCompositeFrom({
+  annotation: `hasAnnotationPart`,
+
+  compose: false,
+
+  inputs: {
+    part: input({type: 'string'}),
+  },
+
+  steps: () => [
+    withHasAnnotationPart({
+      part: input('part'),
+    }),
+
+    exposeDependency({
+      dependency: '#hasAnnotationPart',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/content/helpers/withExpressedOrImplicitArtistReferences.js b/src/data/composite/things/content/helpers/withExpressedOrImplicitArtistReferences.js
new file mode 100644
index 00000000..62799d43
--- /dev/null
+++ b/src/data/composite/things/content/helpers/withExpressedOrImplicitArtistReferences.js
@@ -0,0 +1,60 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withFilteredList, withMappedList} from '#composite/data';
+import {withContentNodes} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withExpressedOrImplicitArtistReferences`,
+
+  inputs: {
+    from: input({type: 'array', acceptsNull: true}),
+  },
+
+  outputs: ['#artistReferences'],
+
+  steps: () => [
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: expressedArtistReferences,
+      }) =>
+        (expressedArtistReferences
+          ? continuation.raiseOutput({'#artistReferences': expressedArtistReferences})
+          : continuation()),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: 'artistText',
+      output: input.value({'#artistReferences': null}),
+    }),
+
+    withContentNodes({
+      from: 'artistText',
+    }),
+
+    withMappedList({
+      list: '#contentNodes',
+      map: input.value(node =>
+        node.type === 'tag' &&
+        node.data.replacerKey?.data === 'artist'),
+    }).outputs({
+      '#mappedList': '#artistTagFilter',
+    }),
+
+    withFilteredList({
+      list: '#contentNodes',
+      filter: '#artistTagFilter',
+    }).outputs({
+      '#filteredList': '#artistTags',
+    }),
+
+    withMappedList({
+      list: '#artistTags',
+      map: input.value(node =>
+        node.data.replacerValue[0].data),
+    }).outputs({
+      '#mappedList': '#artistReferences',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/content/index.js b/src/data/composite/things/content/index.js
new file mode 100644
index 00000000..4176337d
--- /dev/null
+++ b/src/data/composite/things/content/index.js
@@ -0,0 +1,7 @@
+export {default as contentArtists} from './contentArtists.js';
+export {default as hasAnnotationPart} from './hasAnnotationPart.js';
+export {default as withAnnotationParts} from './withAnnotationParts.js';
+export {default as withHasAnnotationPart} from './withHasAnnotationPart.js';
+export {default as withSourceText} from './withSourceText.js';
+export {default as withSourceURLs} from './withSourceURLs.js';
+export {default as withWebArchiveDate} from './withWebArchiveDate.js';
diff --git a/src/data/composite/things/content/withAnnotationParts.js b/src/data/composite/things/content/withAnnotationParts.js
new file mode 100644
index 00000000..6311b57a
--- /dev/null
+++ b/src/data/composite/things/content/withAnnotationParts.js
@@ -0,0 +1,93 @@
+import {input, templateCompositeFrom} from '#composite';
+import {transposeArrays} from '#sugar';
+import {is} from '#validators';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withPropertyFromList} from '#composite/data';
+import {splitContentNodesAround, withContentNodes} from '#composite/wiki-data';
+
+export default templateCompositeFrom({
+  annotation: `withAnnotationParts`,
+
+  inputs: {
+    mode: input({
+      validate: is('strings', 'nodes'),
+    }),
+  },
+
+  outputs: ['#annotationParts'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'annotation',
+      output: input.value({'#annotationParts': []}),
+    }),
+
+    withContentNodes({
+      from: 'annotation',
+    }),
+
+    splitContentNodesAround({
+      nodes: '#contentNodes',
+      around: input.value(/, */g),
+    }),
+
+    {
+      dependencies: ['#contentNodeLists', input('mode')],
+      compute: (continuation, {
+        ['#contentNodeLists']: nodeLists,
+        [input('mode')]: mode,
+      }) =>
+        (mode === 'nodes'
+          ? continuation.raiseOutput({'#annotationParts': nodeLists})
+          : continuation()),
+    },
+
+    {
+      dependencies: ['#contentNodeLists'],
+
+      compute: (continuation, {
+        ['#contentNodeLists']: nodeLists,
+      }) => continuation({
+        ['#firstNodes']:
+          nodeLists.map(list => list.at(0)),
+
+        ['#lastNodes']:
+          nodeLists.map(list => list.at(-1)),
+      }),
+    },
+
+    withPropertyFromList({
+      list: '#firstNodes',
+      property: input.value('i'),
+    }).outputs({
+      '#firstNodes.i': '#startIndices',
+    }),
+
+    withPropertyFromList({
+      list: '#lastNodes',
+      property: input.value('iEnd'),
+    }).outputs({
+      '#lastNodes.iEnd': '#endIndices',
+    }),
+
+    {
+      dependencies: [
+        'annotation',
+        '#startIndices',
+        '#endIndices',
+      ],
+
+      compute: (continuation, {
+        ['annotation']: annotation,
+        ['#startIndices']: startIndices,
+        ['#endIndices']: endIndices,
+      }) => continuation({
+        ['#annotationParts']:
+          transposeArrays([startIndices, endIndices])
+            .map(([start, end]) =>
+              annotation.slice(start, end)),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/content/withHasAnnotationPart.js b/src/data/composite/things/content/withHasAnnotationPart.js
new file mode 100644
index 00000000..4af554f3
--- /dev/null
+++ b/src/data/composite/things/content/withHasAnnotationPart.js
@@ -0,0 +1,43 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withAnnotationParts from './withAnnotationParts.js';
+
+export default templateCompositeFrom({
+  annotation: `withHasAnnotationPart`,
+
+  inputs: {
+    part: input({type: 'string'}),
+  },
+
+  outputs: ['#hasAnnotationPart'],
+
+  steps: () => [
+    withAnnotationParts({
+      mode: input.value('strings'),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#annotationParts',
+      output: input.value({'#hasAnnotationPart': false}),
+    }),
+
+    {
+      dependencies: [
+        input('part'),
+        '#annotationParts',
+      ],
+
+      compute: (continuation, {
+        [input('part')]: search,
+        ['#annotationParts']: parts,
+      }) => continuation({
+        ['#hasAnnotationPart']:
+          parts.some(part =>
+            part.toLowerCase() ===
+            search.toLowerCase()),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/content/withSourceText.js b/src/data/composite/things/content/withSourceText.js
new file mode 100644
index 00000000..292306b7
--- /dev/null
+++ b/src/data/composite/things/content/withSourceText.js
@@ -0,0 +1,53 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+import withAnnotationParts from './withAnnotationParts.js';
+
+export default templateCompositeFrom({
+  annotation: `withSourceText`,
+
+  outputs: ['#sourceText'],
+
+  steps: () => [
+    withAnnotationParts({
+      mode: input.value('nodes'),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#annotationParts',
+      output: input.value({'#sourceText': null}),
+    }),
+
+    {
+      dependencies: ['#annotationParts'],
+      compute: (continuation, {
+        ['#annotationParts']: annotationParts,
+      }) => continuation({
+        ['#firstPartWithExternalLink']:
+          annotationParts
+            .find(nodes => nodes
+              .some(node => node.type === 'external-link')) ??
+          null,
+      }),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: '#firstPartWithExternalLink',
+      output: input.value({'#sourceText': null}),
+    }),
+
+    {
+      dependencies: ['annotation', '#firstPartWithExternalLink'],
+      compute: (continuation, {
+        ['annotation']: annotation,
+        ['#firstPartWithExternalLink']: nodes,
+      }) => continuation({
+        ['#sourceText']:
+          annotation.slice(
+            nodes.at(0).i,
+            nodes.at(-1).iEnd),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/content/withSourceURLs.js b/src/data/composite/things/content/withSourceURLs.js
new file mode 100644
index 00000000..f85ff9ea
--- /dev/null
+++ b/src/data/composite/things/content/withSourceURLs.js
@@ -0,0 +1,62 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withFilteredList, withMappedList} from '#composite/data';
+
+import withAnnotationParts from './withAnnotationParts.js';
+
+export default templateCompositeFrom({
+  annotation: `withSourceURLs`,
+
+  outputs: ['#sourceURLs'],
+
+  steps: () => [
+    withAnnotationParts({
+      mode: input.value('nodes'),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#annotationParts',
+      output: input.value({'#sourceURLs': []}),
+    }),
+
+    {
+      dependencies: ['#annotationParts'],
+      compute: (continuation, {
+        ['#annotationParts']: annotationParts,
+      }) => continuation({
+        ['#firstPartWithExternalLink']:
+          annotationParts
+            .find(nodes => nodes
+              .some(node => node.type === 'external-link')) ??
+          null,
+      }),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: '#firstPartWithExternalLink',
+      output: input.value({'#sourceURLs': []}),
+    }),
+
+    withMappedList({
+      list: '#firstPartWithExternalLink',
+      map: input.value(node => node.type === 'external-link'),
+    }).outputs({
+      '#mappedList': '#externalLinkFilter',
+    }),
+
+    withFilteredList({
+      list: '#firstPartWithExternalLink',
+      filter: '#externalLinkFilter',
+    }).outputs({
+      '#filteredList': '#externalLinks',
+    }),
+
+    withMappedList({
+      list: '#externalLinks',
+      map: input.value(node => node.data.href),
+    }).outputs({
+      '#mappedList': '#sourceURLs',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/content/withWebArchiveDate.js b/src/data/composite/things/content/withWebArchiveDate.js
new file mode 100644
index 00000000..3aaa4f64
--- /dev/null
+++ b/src/data/composite/things/content/withWebArchiveDate.js
@@ -0,0 +1,41 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+
+export default templateCompositeFrom({
+  annotation: `withWebArchiveDate`,
+
+  outputs: ['#webArchiveDate'],
+
+  steps: () => [
+    {
+      dependencies: ['annotation'],
+
+      compute: (continuation, {annotation}) =>
+        continuation({
+          ['#dateText']:
+            annotation
+              ?.match(/https?:\/\/web.archive.org\/web\/([0-9]{8,8})[0-9]*\//)
+              ?.[1] ??
+            null,
+        }),
+    },
+
+    raiseOutputWithoutDependency({
+      dependency: '#dateText',
+      output: input.value({['#webArchiveDate']: null}),
+    }),
+
+    {
+      dependencies: ['#dateText'],
+      compute: (continuation, {['#dateText']: dateText}) =>
+        continuation({
+          ['#webArchiveDate']:
+            new Date(
+              dateText.slice(0, 4) + '/' +
+              dateText.slice(4, 6) + '/' +
+              dateText.slice(6, 8)),
+        }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/contribution/thingPropertyMatches.js b/src/data/composite/things/contribution/thingPropertyMatches.js
index 4a37f2cf..a678c3f5 100644
--- a/src/data/composite/things/contribution/thingPropertyMatches.js
+++ b/src/data/composite/things/contribution/thingPropertyMatches.js
@@ -12,19 +12,31 @@ export default templateCompositeFrom({
   },
 
   steps: () => [
+    {
+      dependencies: ['thing', 'thingProperty'],
+
+      compute: (continuation, {thing, thingProperty}) =>
+        continuation({
+          ['#thingProperty']:
+            (thing.constructor[Symbol.for('Thing.referenceType')] === 'artwork'
+              ? thing.artistContribsFromThingProperty
+              : thingProperty),
+        }),
+    },
+
     exitWithoutDependency({
-      dependency: 'thingProperty',
+      dependency: '#thingProperty',
       value: input.value(false),
     }),
 
     {
       dependencies: [
-        'thingProperty',
+        '#thingProperty',
         input('value'),
       ],
 
       compute: ({
-        ['thingProperty']: thingProperty,
+        ['#thingProperty']: thingProperty,
         [input('value')]: value,
       }) =>
         thingProperty === value,
diff --git a/src/data/composite/things/contribution/thingReferenceTypeMatches.js b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
index 2ee811af..4042e78f 100644
--- a/src/data/composite/things/contribution/thingReferenceTypeMatches.js
+++ b/src/data/composite/things/contribution/thingReferenceTypeMatches.js
@@ -29,10 +29,37 @@ export default templateCompositeFrom({
         input('value'),
       ],
 
-      compute: ({
+      compute: (continuation, {
         ['#thing.constructor']: constructor,
         [input('value')]: value,
       }) =>
+        (constructor[Symbol.for('Thing.referenceType')] === value
+          ? continuation.exit(true)
+       : constructor[Symbol.for('Thing.referenceType')] === 'artwork'
+          ? continuation()
+          : continuation.exit(false)),
+    },
+
+    withPropertyFromObject({
+      object: 'thing',
+      property: input.value('thing'),
+    }),
+
+    withPropertyFromObject({
+      object: '#thing.thing',
+      property: input.value('constructor'),
+    }),
+
+    {
+      dependencies: [
+        '#thing.thing.constructor',
+        input('value'),
+      ],
+
+      compute: ({
+        ['#thing.thing.constructor']: constructor,
+        [input('value')]: value,
+      }) =>
         constructor[Symbol.for('Thing.referenceType')] === value,
     },
   ],
diff --git a/src/data/composite/things/track-section/withContinueCountingFrom.js b/src/data/composite/things/track-section/withContinueCountingFrom.js
index e034b7a5..0ca52b6c 100644
--- a/src/data/composite/things/track-section/withContinueCountingFrom.js
+++ b/src/data/composite/things/track-section/withContinueCountingFrom.js
@@ -1,4 +1,4 @@
-import {input, templateCompositeFrom} from '#composite';
+import {templateCompositeFrom} from '#composite';
 
 import withStartCountingFrom from './withStartCountingFrom.js';
 
diff --git a/src/data/composite/things/track/index.js b/src/data/composite/things/track/index.js
index bab97882..e789e736 100644
--- a/src/data/composite/things/track/index.js
+++ b/src/data/composite/things/track/index.js
@@ -1,10 +1,10 @@
 export {default as exitWithoutUniqueCoverArt} from './exitWithoutUniqueCoverArt.js';
 export {default as inheritContributionListFromMainRelease} from './inheritContributionListFromMainRelease.js';
 export {default as inheritFromMainRelease} from './inheritFromMainRelease.js';
-export {default as withAlbum} from './withAlbum.js';
 export {default as withAllReleases} from './withAllReleases.js';
 export {default as withAlwaysReferenceByDirectory} from './withAlwaysReferenceByDirectory.js';
 export {default as withContainingTrackSection} from './withContainingTrackSection.js';
+export {default as withCoverArtistContribs} from './withCoverArtistContribs.js';
 export {default as withDate} from './withDate.js';
 export {default as withDirectorySuffix} from './withDirectorySuffix.js';
 export {default as withHasUniqueCoverArt} from './withHasUniqueCoverArt.js';
diff --git a/src/data/composite/things/track/trackAdditionalNameList.js b/src/data/composite/things/track/trackAdditionalNameList.js
deleted file mode 100644
index 65a2263d..00000000
--- a/src/data/composite/things/track/trackAdditionalNameList.js
+++ /dev/null
@@ -1,38 +0,0 @@
-// Compiles additional names from various sources.
-
-import {input, templateCompositeFrom} from '#composite';
-import {isAdditionalNameList} from '#validators';
-
-import withInferredAdditionalNames from './withInferredAdditionalNames.js';
-import withSharedAdditionalNames from './withSharedAdditionalNames.js';
-
-export default templateCompositeFrom({
-  annotation: `trackAdditionalNameList`,
-
-  compose: false,
-
-  update: {validate: isAdditionalNameList},
-
-  steps: () => [
-    withInferredAdditionalNames(),
-    withSharedAdditionalNames(),
-
-    {
-      dependencies: [
-        '#inferredAdditionalNames',
-        '#sharedAdditionalNames',
-        input.updateValue(),
-      ],
-
-      compute: ({
-        ['#inferredAdditionalNames']: inferredAdditionalNames,
-        ['#sharedAdditionalNames']: sharedAdditionalNames,
-        [input.updateValue()]: providedAdditionalNames,
-      }) => [
-        ...providedAdditionalNames ?? [],
-        ...sharedAdditionalNames,
-        ...inferredAdditionalNames,
-      ],
-    },
-  ],
-});
diff --git a/src/data/composite/things/track/withAlbum.js b/src/data/composite/things/track/withAlbum.js
deleted file mode 100644
index 4c55e1f4..00000000
--- a/src/data/composite/things/track/withAlbum.js
+++ /dev/null
@@ -1,22 +0,0 @@
-// Gets the track's album. This will early exit if albumData is missing.
-// If there's no album whose list of tracks includes this track, the output
-// dependency will be null.
-
-import {templateCompositeFrom} from '#composite';
-
-import {withUniqueReferencingThing} from '#composite/wiki-data';
-import {soupyReverse} from '#composite/wiki-properties';
-
-export default templateCompositeFrom({
-  annotation: `withAlbum`,
-
-  outputs: ['#album'],
-
-  steps: () => [
-    withUniqueReferencingThing({
-      reverse: soupyReverse.input('albumsWhoseTracksInclude'),
-    }).outputs({
-      ['#uniqueReferencingThing']: '#album',
-    }),
-  ],
-});
diff --git a/src/data/composite/things/track/withAllReleases.js b/src/data/composite/things/track/withAllReleases.js
index b93bf753..891db102 100644
--- a/src/data/composite/things/track/withAllReleases.js
+++ b/src/data/composite/things/track/withAllReleases.js
@@ -8,7 +8,6 @@
 import {input, templateCompositeFrom} from '#composite';
 import {sortByDate} from '#sort';
 
-import {exitWithoutDependency} from '#composite/control-flow';
 import {withPropertyFromObject} from '#composite/data';
 
 import withMainRelease from './withMainRelease.js';
diff --git a/src/data/composite/things/track/withAlwaysReferenceByDirectory.js b/src/data/composite/things/track/withAlwaysReferenceByDirectory.js
index aebcf793..87edf21e 100644
--- a/src/data/composite/things/track/withAlwaysReferenceByDirectory.js
+++ b/src/data/composite/things/track/withAlwaysReferenceByDirectory.js
@@ -9,7 +9,6 @@ import {isBoolean} from '#validators';
 
 import {withPropertyFromObject} from '#composite/data';
 import {withResolvedReference} from '#composite/wiki-data';
-import {soupyFind} from '#composite/wiki-properties';
 
 import {
   exitWithoutDependency,
@@ -17,6 +16,8 @@ import {
   exposeUpdateValueOrContinue,
 } from '#composite/control-flow';
 
+import withPropertyFromAlbum from './withPropertyFromAlbum.js';
+
 export default templateCompositeFrom({
   annotation: `withAlwaysReferenceByDirectory`,
 
@@ -27,18 +28,7 @@ export default templateCompositeFrom({
       validate: input.value(isBoolean),
     }),
 
-    // withAlwaysReferenceByDirectory is sort of a fragile area - we can't
-    // find the track's album the normal way because albums' track lists
-    // recurse back into alwaysReferenceByDirectory!
-    withResolvedReference({
-      ref: 'dataSourceAlbum',
-      find: soupyFind.input('album'),
-    }).outputs({
-      '#resolvedReference': '#album',
-    }),
-
-    withPropertyFromObject({
-      object: '#album',
+    withPropertyFromAlbum({
       property: input.value('alwaysReferenceTracksByDirectory'),
     }),
 
diff --git a/src/data/composite/things/track/withCoverArtistContribs.js b/src/data/composite/things/track/withCoverArtistContribs.js
new file mode 100644
index 00000000..9057cfeb
--- /dev/null
+++ b/src/data/composite/things/track/withCoverArtistContribs.js
@@ -0,0 +1,73 @@
+import {input, templateCompositeFrom} from '#composite';
+import {isContributionList} from '#validators';
+
+import {exposeDependencyOrContinue} from '#composite/control-flow';
+
+import {
+  withRecontextualizedContributionList,
+  withRedatedContributionList,
+  withResolvedContribs,
+} from '#composite/wiki-data';
+
+import exitWithoutUniqueCoverArt from './exitWithoutUniqueCoverArt.js';
+import withPropertyFromAlbum from './withPropertyFromAlbum.js';
+import withTrackArtDate from './withTrackArtDate.js';
+
+export default templateCompositeFrom({
+  annotation: `withCoverArtistContribs`,
+
+  inputs: {
+    from: input({
+      defaultDependency: 'coverArtistContribs',
+      validate: isContributionList,
+      acceptsNull: true,
+    }),
+  },
+
+  outputs: ['#coverArtistContribs'],
+
+  steps: () => [
+    exitWithoutUniqueCoverArt({
+      value: input.value([]),
+    }),
+
+    withTrackArtDate(),
+
+    withResolvedContribs({
+      from: input('from'),
+      thingProperty: input.value('coverArtistContribs'),
+      artistProperty: input.value('trackCoverArtistContributions'),
+      date: '#trackArtDate',
+    }).outputs({
+      '#resolvedContribs': '#coverArtistContribs',
+    }),
+
+    exposeDependencyOrContinue({
+      dependency: '#coverArtistContribs',
+      mode: input.value('empty'),
+    }),
+
+    withPropertyFromAlbum({
+      property: input.value('trackCoverArtistContribs'),
+    }),
+
+    withRecontextualizedContributionList({
+      list: '#album.trackCoverArtistContribs',
+      artistProperty: input.value('trackCoverArtistContributions'),
+    }),
+
+    withRedatedContributionList({
+      list: '#album.trackCoverArtistContribs',
+      date: '#trackArtDate',
+    }),
+
+    {
+      dependencies: ['#album.trackCoverArtistContribs'],
+      compute: (continuation, {
+        ['#album.trackCoverArtistContribs']: coverArtistContribs,
+      }) => continuation({
+        ['#coverArtistContribs']: coverArtistContribs,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/track/withHasUniqueCoverArt.js b/src/data/composite/things/track/withHasUniqueCoverArt.js
index f7e65f25..85d3b92a 100644
--- a/src/data/composite/things/track/withHasUniqueCoverArt.js
+++ b/src/data/composite/things/track/withHasUniqueCoverArt.js
@@ -5,11 +5,18 @@
 // or a placeholder. (This property is named hasUniqueCoverArt instead of
 // the usual hasCoverArt to emphasize that it does not inherit from the
 // album.)
+//
+// withHasUniqueCoverArt is based only around the presence of *specified*
+// cover artist contributions, not whether the references to artists on those
+// contributions actually resolve to anything. It completely evades interacting
+// with find/replace.
 
 import {input, templateCompositeFrom} from '#composite';
-import {empty} from '#sugar';
 
-import {withResolvedContribs} from '#composite/wiki-data';
+import {raiseOutputWithoutDependency, withResultOfAvailabilityCheck}
+  from '#composite/control-flow';
+import {fillMissingListItems, withFlattenedList, withPropertyFromList}
+  from '#composite/data';
 
 import withPropertyFromAlbum from './withPropertyFromAlbum.js';
 
@@ -29,36 +36,73 @@ export default templateCompositeFrom({
           : continuation()),
     },
 
-    withResolvedContribs({
+    withResultOfAvailabilityCheck({
       from: 'coverArtistContribs',
-      date: input.value(null),
+      mode: input.value('empty'),
     }),
 
     {
-      dependencies: ['#resolvedContribs'],
+      dependencies: ['#availability'],
       compute: (continuation, {
-        ['#resolvedContribs']: contribsFromTrack,
+        ['#availability']: availability,
       }) =>
-        (empty(contribsFromTrack)
-          ? continuation()
-          : continuation.raiseOutput({
+        (availability
+          ? continuation.raiseOutput({
               ['#hasUniqueCoverArt']: true,
-            })),
+            })
+          : continuation()),
     },
 
     withPropertyFromAlbum({
       property: input.value('trackCoverArtistContribs'),
+      internal: input.value(true),
+    }),
+
+    withResultOfAvailabilityCheck({
+      from: '#album.trackCoverArtistContribs',
+      mode: input.value('empty'),
     }),
 
     {
-      dependencies: ['#album.trackCoverArtistContribs'],
+      dependencies: ['#availability'],
       compute: (continuation, {
-        ['#album.trackCoverArtistContribs']: contribsFromAlbum,
+        ['#availability']: availability,
       }) =>
-        continuation.raiseOutput({
-          ['#hasUniqueCoverArt']:
-            !empty(contribsFromAlbum),
-        }),
+        (availability
+          ? continuation.raiseOutput({
+              ['#hasUniqueCoverArt']: true,
+            })
+          : continuation()),
     },
+
+    raiseOutputWithoutDependency({
+      dependency: 'trackArtworks',
+      mode: input.value('empty'),
+      output: input.value({'#hasUniqueCoverArt': false}),
+    }),
+
+    withPropertyFromList({
+      list: 'trackArtworks',
+      property: input.value('artistContribs'),
+      internal: input.value(true),
+    }),
+
+    // Since we're getting the update value for each artwork's artistContribs,
+    // it may not be set at all, and in that case won't be exposing as [].
+    fillMissingListItems({
+      list: '#trackArtworks.artistContribs',
+      fill: input.value([]),
+    }),
+
+    withFlattenedList({
+      list: '#trackArtworks.artistContribs',
+    }),
+
+    withResultOfAvailabilityCheck({
+      from: '#flattenedList',
+      mode: input.value('empty'),
+    }).outputs({
+      '#availability': '#hasUniqueCoverArt',
+    }),
   ],
 });
diff --git a/src/data/composite/things/track/withOtherReleases.js b/src/data/composite/things/track/withOtherReleases.js
index 0639742f..bb3e8983 100644
--- a/src/data/composite/things/track/withOtherReleases.js
+++ b/src/data/composite/things/track/withOtherReleases.js
@@ -3,9 +3,6 @@
 
 import {input, templateCompositeFrom} from '#composite';
 
-import {exitWithoutDependency} from '#composite/control-flow';
-import {withPropertyFromObject} from '#composite/data';
-
 import withAllReleases from './withAllReleases.js';
 
 export default templateCompositeFrom({
diff --git a/src/data/composite/things/track/withPropertyFromAlbum.js b/src/data/composite/things/track/withPropertyFromAlbum.js
index e9c5b56e..a203c2e7 100644
--- a/src/data/composite/things/track/withPropertyFromAlbum.js
+++ b/src/data/composite/things/track/withPropertyFromAlbum.js
@@ -5,13 +5,12 @@ import {input, templateCompositeFrom} from '#composite';
 
 import {withPropertyFromObject} from '#composite/data';
 
-import withAlbum from './withAlbum.js';
-
 export default templateCompositeFrom({
   annotation: `withPropertyFromAlbum`,
 
   inputs: {
     property: input.staticValue({type: 'string'}),
+    internal: input({type: 'boolean', defaultValue: false}),
   },
 
   outputs: ({
@@ -19,11 +18,21 @@ export default templateCompositeFrom({
   }) => ['#album.' + property],
 
   steps: () => [
-    withAlbum(),
+    // XXX: This is a ridiculous hack considering `defaultValue` above.
+    // If we were certain what was up, we'd just get around to fixing it LOL
+    {
+      dependencies: [input('internal')],
+      compute: (continuation, {
+        [input('internal')]: internal,
+      }) => continuation({
+        ['#internal']: internal ?? false,
+      }),
+    },
 
     withPropertyFromObject({
-      object: '#album',
+      object: 'album',
       property: input('property'),
+      internal: '#internal',
     }),
 
     {
diff --git a/src/data/composite/things/track/withTrackArtDate.js b/src/data/composite/things/track/withTrackArtDate.js
index e2c4d8bc..9b7b61c7 100644
--- a/src/data/composite/things/track/withTrackArtDate.js
+++ b/src/data/composite/things/track/withTrackArtDate.js
@@ -1,11 +1,3 @@
-// Gets the date of cover art release. This represents only the track's own
-// unique cover artwork, if any.
-//
-// If the 'fallback' option is false (the default), this will only output
-// the track's own coverArtDate or its album's trackArtDate. If 'fallback'
-// is set, and neither of these is available, it'll output the track's own
-// date instead.
-
 import {input, templateCompositeFrom} from '#composite';
 import {isDate} from '#validators';
 
@@ -24,11 +16,6 @@ export default templateCompositeFrom({
       defaultDependency: 'coverArtDate',
       acceptsNull: true,
     }),
-
-    fallback: input({
-      type: 'boolean',
-      defaultValue: false,
-    }),
   },
 
   outputs: ['#trackArtDate'],
@@ -57,20 +44,13 @@ export default templateCompositeFrom({
     }),
 
     {
-      dependencies: [
-        '#album.trackArtDate',
-        input('fallback'),
-      ],
-
+      dependencies: ['#album.trackArtDate'],
       compute: (continuation, {
         ['#album.trackArtDate']: albumTrackArtDate,
-        [input('fallback')]: fallback,
       }) =>
         (albumTrackArtDate
           ? continuation.raiseOutput({'#trackArtDate': albumTrackArtDate})
-       : fallback
-          ? continuation()
-          : continuation.raiseOutput({'#trackArtDate': null})),
+          : continuation()),
     },
 
     withDate().outputs({
diff --git a/src/data/composite/wiki-data/index.js b/src/data/composite/wiki-data/index.js
index be83e4c9..38afc2ac 100644
--- a/src/data/composite/wiki-data/index.js
+++ b/src/data/composite/wiki-data/index.js
@@ -11,18 +11,19 @@ export {default as inputNotFoundMode} from './inputNotFoundMode.js';
 export {default as inputSoupyFind} from './inputSoupyFind.js';
 export {default as inputSoupyReverse} from './inputSoupyReverse.js';
 export {default as inputWikiData} from './inputWikiData.js';
+export {default as splitContentNodesAround} from './splitContentNodesAround.js';
 export {default as withClonedThings} from './withClonedThings.js';
+export {default as withConstitutedArtwork} from './withConstitutedArtwork.js';
+export {default as withContentNodes} from './withContentNodes.js';
 export {default as withContributionListSums} from './withContributionListSums.js';
 export {default as withCoverArtDate} from './withCoverArtDate.js';
 export {default as withDirectory} from './withDirectory.js';
-export {default as withParsedCommentaryEntries} from './withParsedCommentaryEntries.js';
 export {default as withRecontextualizedContributionList} from './withRecontextualizedContributionList.js';
 export {default as withRedatedContributionList} from './withRedatedContributionList.js';
 export {default as withResolvedAnnotatedReferenceList} from './withResolvedAnnotatedReferenceList.js';
 export {default as withResolvedContribs} from './withResolvedContribs.js';
 export {default as withResolvedReference} from './withResolvedReference.js';
 export {default as withResolvedReferenceList} from './withResolvedReferenceList.js';
-export {default as withResolvedSeriesList} from './withResolvedSeriesList.js';
 export {default as withReverseReferenceList} from './withReverseReferenceList.js';
 export {default as withThingsSortedAlphabetically} from './withThingsSortedAlphabetically.js';
 export {default as withUniqueReferencingThing} from './withUniqueReferencingThing.js';
diff --git a/src/data/composite/wiki-data/splitContentNodesAround.js b/src/data/composite/wiki-data/splitContentNodesAround.js
new file mode 100644
index 00000000..6648d8e1
--- /dev/null
+++ b/src/data/composite/wiki-data/splitContentNodesAround.js
@@ -0,0 +1,87 @@
+import {input, templateCompositeFrom} from '#composite';
+import {splitContentNodesAround} from '#replacer';
+import {anyOf, isFunction, validateInstanceOf} from '#validators';
+
+import {withFilteredList, withMappedList, withUnflattenedList}
+  from '#composite/data';
+
+export default templateCompositeFrom({
+  annotation: `splitContentNodesAround`,
+
+  inputs: {
+    nodes: input({type: 'array'}),
+
+    around: input({
+      validate:
+        anyOf(isFunction, validateInstanceOf(RegExp)),
+    }),
+  },
+
+  outputs: ['#contentNodeLists'],
+
+  steps: () => [
+    {
+      dependencies: [input('nodes'), input('around')],
+
+      compute: (continuation, {
+        [input('nodes')]: nodes,
+        [input('around')]: splitter,
+      }) => continuation({
+        ['#nodes']:
+          Array.from(splitContentNodesAround(nodes, splitter)),
+      }),
+    },
+
+    withMappedList({
+      list: '#nodes',
+      map: input.value(node => node.type === 'separator'),
+    }).outputs({
+      '#mappedList': '#separatorFilter',
+    }),
+
+    withMappedList({
+      list: '#separatorFilter',
+      filter: '#separatorFilter',
+      map: input.value((_node, index) => index),
+    }),
+
+    withFilteredList({
+      list: '#mappedList',
+      filter: '#separatorFilter',
+    }).outputs({
+      '#filteredList': '#separatorIndices',
+    }),
+
+    {
+      dependencies: ['#nodes', '#separatorFilter'],
+
+      compute: (continuation, {
+        ['#nodes']: nodes,
+        ['#separatorFilter']: separatorFilter,
+      }) => continuation({
+        ['#nodes']:
+          nodes.map((node, index) =>
+            (separatorFilter[index]
+              ? null
+              : node)),
+      }),
+    },
+
+    {
+      dependencies: ['#separatorIndices'],
+      compute: (continuation, {
+        ['#separatorIndices']: separatorIndices,
+      }) => continuation({
+        ['#unflattenIndices']:
+          [0, ...separatorIndices],
+      }),
+    },
+
+    withUnflattenedList({
+      list: '#nodes',
+      indices: '#unflattenIndices',
+    }).outputs({
+      '#unflattenedList': '#contentNodeLists',
+    }),
+  ],
+});
diff --git a/src/data/composite/wiki-data/withConstitutedArtwork.js b/src/data/composite/wiki-data/withConstitutedArtwork.js
new file mode 100644
index 00000000..28d719e2
--- /dev/null
+++ b/src/data/composite/wiki-data/withConstitutedArtwork.js
@@ -0,0 +1,60 @@
+import {input, templateCompositeFrom} from '#composite';
+import thingConstructors from '#things';
+
+export default templateCompositeFrom({
+  annotation: `withConstitutedArtwork`,
+
+  inputs: {
+    thingProperty: input({type: 'string', acceptsNull: true}),
+    dimensionsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    fileExtensionFromThingProperty: input({type: 'string', acceptsNull: true}),
+    dateFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsArtistProperty: input({type: 'string', acceptsNull: true}),
+    artTagsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    referencedArtworksFromThingProperty: input({type: 'string', acceptsNull: true}),
+  },
+
+  outputs: ['#constitutedArtwork'],
+
+  steps: () => [
+    {
+      dependencies: [
+        input.myself(),
+        input('thingProperty'),
+        input('dimensionsFromThingProperty'),
+        input('fileExtensionFromThingProperty'),
+        input('dateFromThingProperty'),
+        input('artistContribsFromThingProperty'),
+        input('artistContribsArtistProperty'),
+        input('artTagsFromThingProperty'),
+        input('referencedArtworksFromThingProperty'),
+      ],
+
+      compute: (continuation, {
+        [input.myself()]: myself,
+        [input('thingProperty')]: thingProperty,
+        [input('dimensionsFromThingProperty')]: dimensionsFromThingProperty,
+        [input('fileExtensionFromThingProperty')]: fileExtensionFromThingProperty,
+        [input('dateFromThingProperty')]: dateFromThingProperty,
+        [input('artistContribsFromThingProperty')]: artistContribsFromThingProperty,
+        [input('artistContribsArtistProperty')]: artistContribsArtistProperty,
+        [input('artTagsFromThingProperty')]: artTagsFromThingProperty,
+        [input('referencedArtworksFromThingProperty')]: referencedArtworksFromThingProperty,
+      }) => continuation({
+        ['#constitutedArtwork']:
+          Object.assign(new thingConstructors.Artwork, {
+            thing: myself,
+            thingProperty,
+            dimensionsFromThingProperty,
+            fileExtensionFromThingProperty,
+            artistContribsFromThingProperty,
+            artistContribsArtistProperty,
+            artTagsFromThingProperty,
+            dateFromThingProperty,
+            referencedArtworksFromThingProperty,
+          }),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withContentNodes.js b/src/data/composite/wiki-data/withContentNodes.js
new file mode 100644
index 00000000..d014d43b
--- /dev/null
+++ b/src/data/composite/wiki-data/withContentNodes.js
@@ -0,0 +1,25 @@
+import {input, templateCompositeFrom} from '#composite';
+import {parseContentNodes} from '#replacer';
+
+export default templateCompositeFrom({
+  annotation: `withContentNodes`,
+
+  inputs: {
+    from: input({type: 'string', acceptsNull: false}),
+  },
+
+  outputs: ['#contentNodes'],
+
+  steps: () => [
+    {
+      dependencies: [input('from')],
+
+      compute: (continuation, {
+        [input('from')]: string,
+      }) => continuation({
+        ['#contentNodes']:
+          parseContentNodes(string),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/withCoverArtDate.js b/src/data/composite/wiki-data/withCoverArtDate.js
index 0c644c77..a114d5ff 100644
--- a/src/data/composite/wiki-data/withCoverArtDate.js
+++ b/src/data/composite/wiki-data/withCoverArtDate.js
@@ -1,7 +1,3 @@
-// Gets the current thing's coverArtDate, or, if the 'fallback' option is set,
-// the thing's date. This is always null if the thing doesn't actually have
-// any coverArtistContribs.
-
 import {input, templateCompositeFrom} from '#composite';
 import {isDate} from '#validators';
 
@@ -18,11 +14,6 @@ export default templateCompositeFrom({
       defaultDependency: 'coverArtDate',
       acceptsNull: true,
     }),
-
-    fallback: input({
-      type: 'boolean',
-      defaultValue: false,
-    }),
   },
 
   outputs: ['#coverArtDate'],
@@ -50,21 +41,11 @@ export default templateCompositeFrom({
     },
 
     {
-      dependencies: [input('fallback')],
-      compute: (continuation, {
-        [input('fallback')]: fallback,
-      }) =>
-        (fallback
-          ? continuation()
-          : continuation.raiseOutput({'#coverArtDate': null})),
-    },
-
-    {
       dependencies: ['date'],
       compute: (continuation, {date}) =>
         (date
-          ? continuation.raiseOutput({'#coverArtDate': date})
-          : continuation.raiseOutput({'#coverArtDate': null})),
+          ? continuation({'#coverArtDate': date})
+          : continuation({'#coverArtDate': null})),
     },
   ],
 });
diff --git a/src/data/composite/wiki-data/withParsedCommentaryEntries.js b/src/data/composite/wiki-data/withParsedCommentaryEntries.js
deleted file mode 100644
index 9bf4278c..00000000
--- a/src/data/composite/wiki-data/withParsedCommentaryEntries.js
+++ /dev/null
@@ -1,260 +0,0 @@
-import {input, templateCompositeFrom} from '#composite';
-import {stitchArrays} from '#sugar';
-import {isCommentary} from '#validators';
-import {commentaryRegexCaseSensitive} from '#wiki-data';
-
-import {
-  fillMissingListItems,
-  withFlattenedList,
-  withPropertiesFromList,
-  withUnflattenedList,
-} from '#composite/data';
-
-import inputSoupyFind from './inputSoupyFind.js';
-import withResolvedReferenceList from './withResolvedReferenceList.js';
-
-export default templateCompositeFrom({
-  annotation: `withParsedCommentaryEntries`,
-
-  inputs: {
-    from: input({validate: isCommentary}),
-  },
-
-  outputs: ['#parsedCommentaryEntries'],
-
-  steps: () => [
-    {
-      dependencies: [input('from')],
-
-      compute: (continuation, {
-        [input('from')]: commentaryText,
-      }) => continuation({
-        ['#rawMatches']:
-          Array.from(commentaryText.matchAll(commentaryRegexCaseSensitive)),
-      }),
-    },
-
-    withPropertiesFromList({
-      list: '#rawMatches',
-      properties: input.value([
-        '0', // The entire match as a string.
-        'groups',
-        'index',
-      ]),
-    }).outputs({
-      '#rawMatches.0': '#rawMatches.text',
-      '#rawMatches.groups': '#rawMatches.groups',
-      '#rawMatches.index': '#rawMatches.startIndex',
-    }),
-
-    {
-      dependencies: [
-        '#rawMatches.text',
-        '#rawMatches.startIndex',
-      ],
-
-      compute: (continuation, {
-        ['#rawMatches.text']: text,
-        ['#rawMatches.startIndex']: startIndex,
-      }) => continuation({
-        ['#rawMatches.endIndex']:
-          stitchArrays({text, startIndex})
-            .map(({text, startIndex}) => startIndex + text.length),
-      }),
-    },
-
-    {
-      dependencies: [
-        input('from'),
-        '#rawMatches.startIndex',
-        '#rawMatches.endIndex',
-      ],
-
-      compute: (continuation, {
-        [input('from')]: commentaryText,
-        ['#rawMatches.startIndex']: startIndex,
-        ['#rawMatches.endIndex']: endIndex,
-      }) => continuation({
-        ['#entries.body']:
-          stitchArrays({startIndex, endIndex})
-            .map(({endIndex}, index, stitched) =>
-              (index === stitched.length - 1
-                ? commentaryText.slice(endIndex)
-                : commentaryText.slice(
-                    endIndex,
-                    stitched[index + 1].startIndex)))
-            .map(body => body.trim()),
-      }),
-    },
-
-    withPropertiesFromList({
-      list: '#rawMatches.groups',
-      prefix: input.value('#entries'),
-      properties: input.value([
-        'artistReferences',
-        'artistDisplayText',
-        'annotation',
-        'date',
-        'secondDate',
-        'dateKind',
-        'accessDate',
-        'accessKind',
-      ]),
-    }),
-
-    // The artistReferences group will always have a value, since it's required
-    // for the line to match in the first place.
-
-    {
-      dependencies: ['#entries.artistReferences'],
-      compute: (continuation, {
-        ['#entries.artistReferences']: artistReferenceTexts,
-      }) => continuation({
-        ['#entries.artistReferences']:
-          artistReferenceTexts
-            .map(text => text.split(',').map(ref => ref.trim())),
-      }),
-    },
-
-    withFlattenedList({
-      list: '#entries.artistReferences',
-    }),
-
-    withResolvedReferenceList({
-      list: '#flattenedList',
-      find: inputSoupyFind.input('artist'),
-      notFoundMode: input.value('null'),
-    }),
-
-    withUnflattenedList({
-      list: '#resolvedReferenceList',
-    }).outputs({
-      '#unflattenedList': '#entries.artists',
-    }),
-
-    fillMissingListItems({
-      list: '#entries.artistDisplayText',
-      fill: input.value(null),
-    }),
-
-    fillMissingListItems({
-      list: '#entries.annotation',
-      fill: input.value(null),
-    }),
-
-    {
-      dependencies: ['#entries.annotation'],
-      compute: (continuation, {
-        ['#entries.annotation']: annotation,
-      }) => continuation({
-        ['#entries.webArchiveDate']:
-          annotation
-            .map(text => text?.match(/https?:\/\/web.archive.org\/web\/([0-9]{8,8})[0-9]*\//))
-            .map(match => match?.[1])
-            .map(dateText =>
-              (dateText
-                ? dateText.slice(0, 4) + '/' +
-                  dateText.slice(4, 6) + '/' +
-                  dateText.slice(6, 8)
-                : null)),
-      }),
-    },
-
-    {
-      dependencies: ['#entries.date'],
-      compute: (continuation, {
-        ['#entries.date']: date,
-      }) => continuation({
-        ['#entries.date']:
-          date
-            .map(date => date ? new Date(date) : null),
-      }),
-    },
-
-    {
-      dependencies: ['#entries.secondDate'],
-      compute: (continuation, {
-        ['#entries.secondDate']: secondDate,
-      }) => continuation({
-        ['#entries.secondDate']:
-          secondDate
-            .map(date => date ? new Date(date) : null),
-      }),
-    },
-
-    fillMissingListItems({
-      list: '#entries.dateKind',
-      fill: input.value(null),
-    }),
-
-    {
-      dependencies: ['#entries.accessDate', '#entries.webArchiveDate'],
-      compute: (continuation, {
-        ['#entries.accessDate']: accessDate,
-        ['#entries.webArchiveDate']: webArchiveDate,
-      }) => continuation({
-        ['#entries.accessDate']:
-          stitchArrays({accessDate, webArchiveDate})
-            .map(({accessDate, webArchiveDate}) =>
-              accessDate ??
-              webArchiveDate ??
-              null)
-            .map(date => date ? new Date(date) : date),
-      }),
-    },
-
-    {
-      dependencies: ['#entries.accessKind', '#entries.webArchiveDate'],
-      compute: (continuation, {
-        ['#entries.accessKind']: accessKind,
-        ['#entries.webArchiveDate']: webArchiveDate,
-      }) => continuation({
-        ['#entries.accessKind']:
-          stitchArrays({accessKind, webArchiveDate})
-            .map(({accessKind, webArchiveDate}) =>
-              accessKind ??
-              (webArchiveDate && 'captured') ??
-              null),
-      }),
-    },
-
-    {
-      dependencies: [
-        '#entries.artists',
-        '#entries.artistDisplayText',
-        '#entries.annotation',
-        '#entries.date',
-        '#entries.secondDate',
-        '#entries.dateKind',
-        '#entries.accessDate',
-        '#entries.accessKind',
-        '#entries.body',
-      ],
-
-      compute: (continuation, {
-        ['#entries.artists']: artists,
-        ['#entries.artistDisplayText']: artistDisplayText,
-        ['#entries.annotation']: annotation,
-        ['#entries.date']: date,
-        ['#entries.secondDate']: secondDate,
-        ['#entries.dateKind']: dateKind,
-        ['#entries.accessDate']: accessDate,
-        ['#entries.accessKind']: accessKind,
-        ['#entries.body']: body,
-      }) => continuation({
-        ['#parsedCommentaryEntries']:
-          stitchArrays({
-            artists,
-            artistDisplayText,
-            annotation,
-            date,
-            secondDate,
-            dateKind,
-            accessDate,
-            accessKind,
-            body,
-          }),
-      }),
-    },
-  ],
-});
diff --git a/src/data/composite/wiki-data/withResolvedAnnotatedReferenceList.js b/src/data/composite/wiki-data/withResolvedAnnotatedReferenceList.js
index c9a7c058..9cc52f29 100644
--- a/src/data/composite/wiki-data/withResolvedAnnotatedReferenceList.js
+++ b/src/data/composite/wiki-data/withResolvedAnnotatedReferenceList.js
@@ -1,6 +1,6 @@
 import {input, templateCompositeFrom} from '#composite';
 import {stitchArrays} from '#sugar';
-import {isDate, isObject, validateArrayItems} from '#validators';
+import {isObject, validateArrayItems} from '#validators';
 
 import {withPropertyFromList} from '#composite/data';
 
@@ -22,11 +22,6 @@ export default templateCompositeFrom({
       acceptsNull: true,
     }),
 
-    date: input({
-      validate: isDate,
-      acceptsNull: true,
-    }),
-
     reference: input({type: 'string', defaultValue: 'reference'}),
     annotation: input({type: 'string', defaultValue: 'annotation'}),
     thing: input({type: 'string', defaultValue: 'thing'}),
@@ -91,17 +86,6 @@ export default templateCompositeFrom({
       }),
     },
 
-    {
-      dependencies: ['#matches', input('date')],
-      compute: (continuation, {
-        ['#matches']: matches,
-        [input('date')]: date,
-      }) => continuation({
-        ['#matches']:
-          matches.map(match => ({...match, date})),
-      }),
-    },
-
     withAvailabilityFilter({
       from: '#resolvedReferenceList',
     }),
diff --git a/src/data/composite/wiki-data/withResolvedSeriesList.js b/src/data/composite/wiki-data/withResolvedSeriesList.js
deleted file mode 100644
index deaab466..00000000
--- a/src/data/composite/wiki-data/withResolvedSeriesList.js
+++ /dev/null
@@ -1,130 +0,0 @@
-import {input, templateCompositeFrom} from '#composite';
-import {stitchArrays} from '#sugar';
-import {isSeriesList, validateThing} from '#validators';
-
-import {raiseOutputWithoutDependency} from '#composite/control-flow';
-
-import {
-  fillMissingListItems,
-  withFlattenedList,
-  withUnflattenedList,
-  withPropertiesFromList,
-} from '#composite/data';
-
-import inputSoupyFind from './inputSoupyFind.js';
-import withResolvedReferenceList from './withResolvedReferenceList.js';
-
-export default templateCompositeFrom({
-  annotation: `withResolvedSeriesList`,
-
-  inputs: {
-    group: input({
-      validate: validateThing({referenceType: 'group'}),
-    }),
-
-    list: input({
-      validate: isSeriesList,
-      acceptsNull: true,
-    }),
-  },
-
-  outputs: ['#resolvedSeriesList'],
-
-  steps: () => [
-    raiseOutputWithoutDependency({
-      dependency: input('list'),
-      mode: input.value('empty'),
-      output: input.value({
-        ['#resolvedSeriesList']: [],
-      }),
-    }),
-
-    withPropertiesFromList({
-      list: input('list'),
-      prefix: input.value('#serieses'),
-      properties: input.value([
-        'name',
-        'description',
-        'albums',
-
-        'showAlbumArtists',
-      ]),
-    }),
-
-    fillMissingListItems({
-      list: '#serieses.albums',
-      fill: input.value([]),
-    }),
-
-    withFlattenedList({
-      list: '#serieses.albums',
-    }),
-
-    withResolvedReferenceList({
-      list: '#flattenedList',
-      find: inputSoupyFind.input('album'),
-      notFoundMode: input.value('null'),
-    }),
-
-    withUnflattenedList({
-      list: '#resolvedReferenceList',
-    }).outputs({
-      '#unflattenedList': '#serieses.albums',
-    }),
-
-    fillMissingListItems({
-      list: '#serieses.description',
-      fill: input.value(null),
-    }),
-
-    fillMissingListItems({
-      list: '#serieses.showAlbumArtists',
-      fill: input.value(null),
-    }),
-
-    {
-      dependencies: [
-        '#serieses.name',
-        '#serieses.description',
-        '#serieses.albums',
-
-        '#serieses.showAlbumArtists',
-      ],
-
-      compute: (continuation, {
-        ['#serieses.name']: name,
-        ['#serieses.description']: description,
-        ['#serieses.albums']: albums,
-
-        ['#serieses.showAlbumArtists']: showAlbumArtists,
-      }) => continuation({
-        ['#seriesProperties']:
-          stitchArrays({
-            name,
-            description,
-            albums,
-
-            showAlbumArtists,
-          }).map(properties => ({
-              ...properties,
-              group: input
-            }))
-      }),
-    },
-
-    {
-      dependencies: ['#seriesProperties', input('group')],
-      compute: (continuation, {
-        ['#seriesProperties']: seriesProperties,
-        [input('group')]: group,
-      }) => continuation({
-        ['#resolvedSeriesList']:
-          seriesProperties
-            .map(properties => ({
-              ...properties,
-              group,
-            })),
-      }),
-    },
-  ],
-});
diff --git a/src/data/composite/wiki-properties/additionalFiles.js b/src/data/composite/wiki-properties/additionalFiles.js
deleted file mode 100644
index 6760527a..00000000
--- a/src/data/composite/wiki-properties/additionalFiles.js
+++ /dev/null
@@ -1,30 +0,0 @@
-// This is a somewhat more involved data structure - it's for additional
-// or "bonus" files associated with albums or tracks (or anything else).
-// It's got this form:
-//
-//   [
-//     {title: 'Booklet', files: ['Booklet.pdf']},
-//     {
-//       title: 'Wallpaper',
-//       description: 'Cool Wallpaper!',
-//       files: ['1440x900.png', '1920x1080.png']
-//     },
-//     {title: 'Alternate Covers', description: null, files: [...]},
-//     ...
-//   ]
-//
-
-import {isAdditionalFileList} from '#validators';
-
-// TODO: Not templateCompositeFrom.
-
-export default function() {
-  return {
-    flags: {update: true, expose: true},
-    update: {validate: isAdditionalFileList},
-    expose: {
-      transform: (additionalFiles) =>
-        additionalFiles ?? [],
-    },
-  };
-}
diff --git a/src/data/composite/wiki-properties/additionalNameList.js b/src/data/composite/wiki-properties/additionalNameList.js
deleted file mode 100644
index c5971d4a..00000000
--- a/src/data/composite/wiki-properties/additionalNameList.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// A list of additional names! These can be used for a variety of purposes,
-// e.g. providing extra searchable titles, localizations, romanizations or
-// original titles, and so on. Each item has a name and, optionally, a
-// descriptive annotation.
-
-import {isAdditionalNameList} from '#validators';
-
-export default function() {
-  return {
-    flags: {update: true, expose: true},
-    update: {validate: isAdditionalNameList},
-    expose: {transform: value => value ?? []},
-  };
-}
diff --git a/src/data/composite/wiki-properties/annotatedReferenceList.js b/src/data/composite/wiki-properties/annotatedReferenceList.js
index bb6875f1..8e6c96a1 100644
--- a/src/data/composite/wiki-properties/annotatedReferenceList.js
+++ b/src/data/composite/wiki-properties/annotatedReferenceList.js
@@ -2,7 +2,6 @@ import {input, templateCompositeFrom} from '#composite';
 
 import {
   isContentString,
-  isDate,
   optional,
   validateArrayItems,
   validateProperties,
@@ -27,11 +26,6 @@ export default templateCompositeFrom({
     data: inputWikiData({allowMixedTypes: true}),
     find: inputSoupyFind(),
 
-    date: input({
-      validate: isDate,
-      acceptsNull: true,
-    }),
-
     reference: input.staticValue({type: 'string', defaultValue: 'reference'}),
     annotation: input.staticValue({type: 'string', defaultValue: 'annotation'}),
     thing: input.staticValue({type: 'string', defaultValue: 'thing'}),
@@ -57,8 +51,6 @@ export default templateCompositeFrom({
     withResolvedAnnotatedReferenceList({
       list: input.updateValue(),
 
-      date: input('date'),
-
       reference: input('reference'),
       annotation: input('annotation'),
       thing: input('thing'),
diff --git a/src/data/composite/wiki-properties/commentary.js b/src/data/composite/wiki-properties/commentary.js
deleted file mode 100644
index 9625278d..00000000
--- a/src/data/composite/wiki-properties/commentary.js
+++ /dev/null
@@ -1,30 +0,0 @@
-// Artist commentary! Generally present on tracks and albums.
-
-import {input, templateCompositeFrom} from '#composite';
-import {isCommentary} from '#validators';
-
-import {exitWithoutDependency, exposeDependency}
-  from '#composite/control-flow';
-import {withParsedCommentaryEntries} from '#composite/wiki-data';
-
-export default templateCompositeFrom({
-  annotation: `commentary`,
-
-  compose: false,
-
-  steps: () => [
-    exitWithoutDependency({
-      dependency: input.updateValue({validate: isCommentary}),
-      mode: input.value('falsy'),
-      value: input.value([]),
-    }),
-
-    withParsedCommentaryEntries({
-      from: input.updateValue(),
-    }),
-
-    exposeDependency({
-      dependency: '#parsedCommentaryEntries',
-    }),
-  ],
-});
diff --git a/src/data/composite/wiki-properties/commentatorArtists.js b/src/data/composite/wiki-properties/commentatorArtists.js
index c5c14769..54d3e1a5 100644
--- a/src/data/composite/wiki-properties/commentatorArtists.js
+++ b/src/data/composite/wiki-properties/commentatorArtists.js
@@ -7,7 +7,6 @@ import {exitWithoutDependency, exposeDependency}
   from '#composite/control-flow';
 import {withFlattenedList, withPropertyFromList, withUniqueItemsOnly}
   from '#composite/data';
-import {withParsedCommentaryEntries} from '#composite/wiki-data';
 
 export default templateCompositeFrom({
   annotation: `commentatorArtists`,
@@ -21,19 +20,13 @@ export default templateCompositeFrom({
       value: input.value([]),
     }),
 
-    withParsedCommentaryEntries({
-      from: 'commentary',
-    }),
-
     withPropertyFromList({
-      list: '#parsedCommentaryEntries',
+      list: 'commentary',
       property: input.value('artists'),
-    }).outputs({
-      '#parsedCommentaryEntries.artists': '#artistLists',
     }),
 
     withFlattenedList({
-      list: '#artistLists',
+      list: '#commentary.artists',
     }).outputs({
       '#flattenedList': '#artists',
     }),
diff --git a/src/data/composite/wiki-properties/constitutibleArtwork.js b/src/data/composite/wiki-properties/constitutibleArtwork.js
new file mode 100644
index 00000000..48f4211a
--- /dev/null
+++ b/src/data/composite/wiki-properties/constitutibleArtwork.js
@@ -0,0 +1,70 @@
+// This composition does not actually inspect the values of any properties
+// specified, so it's not responsible for determining whether a constituted
+// artwork should exist at all.
+
+import {input, templateCompositeFrom} from '#composite';
+import {withEntries} from '#sugar';
+import Thing from '#thing';
+import {validateThing} from '#validators';
+
+import {exposeDependency, exposeUpdateValueOrContinue}
+  from '#composite/control-flow';
+import {withConstitutedArtwork} from '#composite/wiki-data';
+
+const template = templateCompositeFrom({
+  annotation: `constitutibleArtwork`,
+
+  compose: false,
+
+  inputs: {
+    thingProperty: input({type: 'string', acceptsNull: true}),
+    dimensionsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    fileExtensionFromThingProperty: input({type: 'string', acceptsNull: true}),
+    dateFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsArtistProperty: input({type: 'string', acceptsNull: true}),
+    artTagsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    referencedArtworksFromThingProperty: input({type: 'string', acceptsNull: true}),
+  },
+
+  steps: () => [
+    exposeUpdateValueOrContinue({
+      validate: input.value(
+        validateThing({
+          referenceType: 'artwork',
+        })),
+    }),
+
+    withConstitutedArtwork({
+      thingProperty: input('thingProperty'),
+      dimensionsFromThingProperty: input('dimensionsFromThingProperty'),
+      fileExtensionFromThingProperty: input('fileExtensionFromThingProperty'),
+      dateFromThingProperty: input('dateFromThingProperty'),
+      artistContribsFromThingProperty: input('artistContribsFromThingProperty'),
+      artistContribsArtistProperty: input('artistContribsArtistProperty'),
+      artTagsFromThingProperty: input('artTagsFromThingProperty'),
+      referencedArtworksFromThingProperty: input('referencedArtworksFromThingProperty'),
+    }),
+
+    exposeDependency({
+      dependency: '#constitutedArtwork',
+    }),
+  ],
+});
+
+template.fromYAMLFieldSpec = function(field) {
+  const {[Thing.yamlDocumentSpec]: documentSpec} = this;
+
+  const {provide} = documentSpec.fields[field].transform;
+
+  const inputs =
+    withEntries(provide, entries =>
+      entries.map(([property, value]) => [
+        property,
+        input.value(value),
+      ]));
+
+  return template(inputs);
+};
+
+export default template;
diff --git a/src/data/composite/wiki-properties/constitutibleArtworkList.js b/src/data/composite/wiki-properties/constitutibleArtworkList.js
new file mode 100644
index 00000000..dad3a957
--- /dev/null
+++ b/src/data/composite/wiki-properties/constitutibleArtworkList.js
@@ -0,0 +1,72 @@
+// This composition does not actually inspect the values of any properties
+// specified, so it's not responsible for determining whether a constituted
+// artwork should exist at all.
+
+import {input, templateCompositeFrom} from '#composite';
+import {withEntries} from '#sugar';
+import Thing from '#thing';
+import {validateWikiData} from '#validators';
+
+import {exposeUpdateValueOrContinue} from '#composite/control-flow';
+import {withConstitutedArtwork} from '#composite/wiki-data';
+
+const template = templateCompositeFrom({
+  annotation: `constitutibleArtworkList`,
+
+  compose: false,
+
+  inputs: {
+    thingProperty: input({type: 'string', acceptsNull: true}),
+    dimensionsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    fileExtensionFromThingProperty: input({type: 'string', acceptsNull: true}),
+    dateFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    artistContribsArtistProperty: input({type: 'string', acceptsNull: true}),
+    artTagsFromThingProperty: input({type: 'string', acceptsNull: true}),
+    referencedArtworksFromThingProperty: input({type: 'string', acceptsNull: true}),
+  },
+
+  steps: () => [
+    exposeUpdateValueOrContinue({
+      validate: input.value(
+        validateWikiData({
+          referenceType: 'artwork',
+        })),
+    }),
+
+    withConstitutedArtwork({
+      thingProperty: input('thingProperty'),
+      dimensionsFromThingProperty: input('dimensionsFromThingProperty'),
+      fileExtensionFromThingProperty: input('fileExtensionFromThingProperty'),
+      dateFromThingProperty: input('dateFromThingProperty'),
+      artistContribsFromThingProperty: input('artistContribsFromThingProperty'),
+      artistContribsArtistProperty: input('artistContribsArtistProperty'),
+      artTagsFromThingProperty: input('artTagsFromThingProperty'),
+      referencedArtworksFromThingProperty: input('referencedArtworksFromThingProperty'),
+    }),
+
+    {
+      dependencies: ['#constitutedArtwork'],
+      compute: ({
+        ['#constitutedArtwork']: constitutedArtwork,
+      }) => [constitutedArtwork],
+    },
+  ],
+});
+
+template.fromYAMLFieldSpec = function(field) {
+  const {[Thing.yamlDocumentSpec]: documentSpec} = this;
+
+  const {provide} = documentSpec.fields[field].transform;
+
+  const inputs =
+    withEntries(provide, entries =>
+      entries.map(([property, value]) => [
+        property,
+        input.value(value),
+      ]));
+
+  return template(inputs);
+};
+
+export default template;
diff --git a/src/data/composite/wiki-properties/directory.js b/src/data/composite/wiki-properties/directory.js
index 9ca2a204..1756a8e5 100644
--- a/src/data/composite/wiki-properties/directory.js
+++ b/src/data/composite/wiki-properties/directory.js
@@ -18,6 +18,7 @@ export default templateCompositeFrom({
     name: input({
       validate: isName,
       defaultDependency: 'name',
+      acceptsNull: true,
     }),
 
     suffix: input({
diff --git a/src/data/composite/wiki-properties/index.js b/src/data/composite/wiki-properties/index.js
index 4aaaeb72..e8f109d3 100644
--- a/src/data/composite/wiki-properties/index.js
+++ b/src/data/composite/wiki-properties/index.js
@@ -3,12 +3,11 @@
 // Entries here may depend on entries in #composite/control-flow,
 // #composite/data, and #composite/wiki-data.
 
-export {default as additionalFiles} from './additionalFiles.js';
-export {default as additionalNameList} from './additionalNameList.js';
 export {default as annotatedReferenceList} from './annotatedReferenceList.js';
 export {default as color} from './color.js';
-export {default as commentary} from './commentary.js';
 export {default as commentatorArtists} from './commentatorArtists.js';
+export {default as constitutibleArtwork} from './constitutibleArtwork.js';
+export {default as constitutibleArtworkList} from './constitutibleArtworkList.js';
 export {default as contentString} from './contentString.js';
 export {default as contribsPresent} from './contribsPresent.js';
 export {default as contributionList} from './contributionList.js';
@@ -22,7 +21,6 @@ export {default as name} from './name.js';
 export {default as referenceList} from './referenceList.js';
 export {default as referencedArtworkList} from './referencedArtworkList.js';
 export {default as reverseReferenceList} from './reverseReferenceList.js';
-export {default as seriesList} from './seriesList.js';
 export {default as simpleDate} from './simpleDate.js';
 export {default as simpleString} from './simpleString.js';
 export {default as singleReference} from './singleReference.js';
diff --git a/src/data/composite/wiki-properties/referencedArtworkList.js b/src/data/composite/wiki-properties/referencedArtworkList.js
index 819b2f43..4f243493 100644
--- a/src/data/composite/wiki-properties/referencedArtworkList.js
+++ b/src/data/composite/wiki-properties/referencedArtworkList.js
@@ -1,7 +1,5 @@
 import {input, templateCompositeFrom} from '#composite';
 import find from '#find';
-import {isDate} from '#validators';
-import {combineWikiDataArrays} from '#wiki-data';
 
 import annotatedReferenceList from './annotatedReferenceList.js';
 
@@ -10,47 +8,24 @@ export default templateCompositeFrom({
 
   compose: false,
 
-  inputs: {
-    date: input({
-      validate: isDate,
-      acceptsNull: true,
-    }),
-  },
-
   steps: () => [
     {
-      dependencies: [
-        'albumData',
-        'trackData',
-      ],
-
-      compute: (continuation, {
-        albumData,
-        trackData,
-      }) => continuation({
-        ['#data']:
-          combineWikiDataArrays([
-            albumData,
-            trackData,
-          ]),
-      }),
-    },
-
-    {
       compute: (continuation) => continuation({
         ['#find']:
           find.mixed({
-            track: find.trackWithArtwork,
-            album: find.albumWithArtwork,
+            track: find.trackPrimaryArtwork,
+            album: find.albumPrimaryArtwork,
           }),
       }),
     },
 
     annotatedReferenceList({
       referenceType: input.value(['album', 'track']),
-      data: '#data',
+
+      data: 'artworkData',
       find: '#find',
-      date: input('date'),
+
+      thing: input.value('artwork'),
     }),
   ],
 });
diff --git a/src/data/composite/wiki-properties/seriesList.js b/src/data/composite/wiki-properties/seriesList.js
deleted file mode 100644
index 2a101b45..00000000
--- a/src/data/composite/wiki-properties/seriesList.js
+++ /dev/null
@@ -1,31 +0,0 @@
-import {input, templateCompositeFrom} from '#composite';
-import {isSeriesList, validateThing} from '#validators';
-
-import {exposeDependency} from '#composite/control-flow';
-import {withResolvedSeriesList} from '#composite/wiki-data';
-
-export default templateCompositeFrom({
-  annotation: `seriesList`,
-
-  compose: false,
-
-  inputs: {
-    group: input({
-      validate: validateThing({referenceType: 'group'}),
-    }),
-  },
-
-  steps: () => [
-    withResolvedSeriesList({
-      group: input('group'),
-
-      list: input.updateValue({
-        validate: isSeriesList,
-      }),
-    }),
-
-    exposeDependency({
-      dependency: '#resolvedSeriesList',
-    }),
-  ],
-});
diff --git a/src/data/composite/wiki-properties/soupyReverse.js b/src/data/composite/wiki-properties/soupyReverse.js
index 269ccd6f..784a66b4 100644
--- a/src/data/composite/wiki-properties/soupyReverse.js
+++ b/src/data/composite/wiki-properties/soupyReverse.js
@@ -19,4 +19,19 @@ soupyReverse.contributionsBy =
     referenced: contrib => [contrib.artist],
   });
 
+soupyReverse.artworkContributionsBy =
+  (bindTo, artworkProperty, {single = false} = {}) => ({
+    bindTo,
+
+    referencing: thing =>
+      (single
+        ? (thing[artworkProperty]
+            ? thing[artworkProperty].artistContribs
+            : [])
+        : thing[artworkProperty]
+            .flatMap(artwork => artwork.artistContribs)),
+
+    referenced: contrib => [contrib.artist],
+  });
+
 export default soupyReverse;
diff --git a/src/data/thing.js b/src/data/thing.js
index 90453c15..f719224d 100644
--- a/src/data/thing.js
+++ b/src/data/thing.js
@@ -25,6 +25,10 @@ export default class Thing extends CacheableObject {
   static yamlSourceDocument = Symbol.for('Thing.yamlSourceDocument');
   static yamlSourceDocumentPlacement = Symbol.for('Thing.yamlSourceDocumentPlacement');
 
+  [Symbol.for('Thing.yamlSourceFilename')] = null;
+  [Symbol.for('Thing.yamlSourceDocument')] = null;
+  [Symbol.for('Thing.yamlSourceDocumentPlacement')] = null;
+
   static isThingConstructor = Symbol.for('Thing.isThingConstructor');
   static isThing = Symbol.for('Thing.isThing');
 
@@ -33,11 +37,13 @@ export default class Thing extends CacheableObject {
   static [Symbol.for('Thing.isThingConstructor')] = NaN;
 
   constructor() {
-    super();
+    super({seal: false});
 
     // To detect:
     // Object.hasOwn(object, Symbol.for('Thing.isThing'))
     this[Symbol.for('Thing.isThing')] = NaN;
+
+    Object.seal(this);
   }
 
   static [Symbol.for('Thing.selectAll')] = _wikiData => [];
@@ -54,7 +60,7 @@ export default class Thing extends CacheableObject {
       if (this.name) {
         name = colors.green(`"${this.name}"`);
       }
-    } catch (error) {
+    } catch {
       name = colors.yellow(`couldn't get name`);
     }
 
@@ -63,7 +69,7 @@ export default class Thing extends CacheableObject {
       if (this.directory) {
         reference = colors.blue(Thing.getReference(this));
       }
-    } catch (error) {
+    } catch {
       reference = colors.yellow(`couldn't get reference`);
     }
 
diff --git a/src/data/things/additional-file.js b/src/data/things/additional-file.js
new file mode 100644
index 00000000..398d0af5
--- /dev/null
+++ b/src/data/things/additional-file.js
@@ -0,0 +1,47 @@
+import {input} from '#composite';
+import Thing from '#thing';
+import {isString, validateArrayItems} from '#validators';
+
+import {contentString, simpleString, thing} from '#composite/wiki-properties';
+
+import {exposeConstant, exposeUpdateValueOrContinue}
+  from '#composite/control-flow';
+
+export class AdditionalFile extends Thing {
+  static [Thing.getPropertyDescriptors] = () => ({
+    // Update & expose
+
+    thing: thing(),
+
+    title: simpleString(),
+
+    description: contentString(),
+
+    filenames: [
+      exposeUpdateValueOrContinue({
+        validate: input.value(validateArrayItems(isString)),
+      }),
+
+      exposeConstant({
+        value: input.value([]),
+      }),
+    ],
+  });
+
+  static [Thing.yamlDocumentSpec] = {
+    fields: {
+      'Title': {property: 'title'},
+      'Description': {property: 'description'},
+      'Files': {property: 'filenames'},
+    },
+  };
+
+  get paths() {
+    if (!this.thing) return null;
+    if (!this.thing.getOwnAdditionalFilePath) return null;
+
+    return (
+      this.filenames.map(filename =>
+        this.thing.getOwnAdditionalFilePath(this, filename)));
+  }
+}
diff --git a/src/data/things/additional-name.js b/src/data/things/additional-name.js
new file mode 100644
index 00000000..4c23f291
--- /dev/null
+++ b/src/data/things/additional-name.js
@@ -0,0 +1,21 @@
+import Thing from '#thing';
+
+import {contentString, thing} from '#composite/wiki-properties';
+
+export class AdditionalName extends Thing {
+  static [Thing.getPropertyDescriptors] = () => ({
+    // Update & expose
+
+    thing: thing(),
+
+    name: contentString(),
+    annotation: contentString(),
+  });
+
+  static [Thing.yamlDocumentSpec] = {
+    fields: {
+      'Name': {property: 'name'},
+      'Annotation': {property: 'annotation'},
+    },
+  };
+}
diff --git a/src/data/things/album.js b/src/data/things/album.js
index 5aba75f7..5132b962 100644
--- a/src/data/things/album.js
+++ b/src/data/things/album.js
@@ -3,11 +3,12 @@ export const DATA_ALBUM_DIRECTORY = 'album';
 import * as path from 'node:path';
 import {inspect} from 'node:util';
 
+import CacheableObject from '#cacheable-object';
 import {colors} from '#cli';
 import {input} from '#composite';
 import {traverse} from '#node-utils';
 import {sortAlbumsTracksChronologically, sortChronologically} from '#sort';
-import {accumulateSum, empty} from '#sugar';
+import {empty} from '#sugar';
 import Thing from '#thing';
 import {isColor, isDate, isDirectory, isNumber} from '#validators';
 
@@ -15,7 +16,10 @@ import {
   parseAdditionalFiles,
   parseAdditionalNames,
   parseAnnotatedReferences,
+  parseArtwork,
+  parseCommentary,
   parseContributors,
+  parseCreditingSources,
   parseDate,
   parseDimensions,
   parseWallpaperParts,
@@ -29,11 +33,10 @@ import {exitWithoutContribs, withDirectory, withCoverArtDate}
   from '#composite/wiki-data';
 
 import {
-  additionalFiles,
-  additionalNameList,
-  commentary,
   color,
   commentatorArtists,
+  constitutibleArtwork,
+  constitutibleArtworkList,
   contentString,
   contribsPresent,
   contributionList,
@@ -44,7 +47,6 @@ import {
   name,
   referencedArtworkList,
   referenceList,
-  reverseReferenceList,
   simpleDate,
   simpleString,
   soupyFind,
@@ -56,7 +58,7 @@ import {
   wikiData,
 } from '#composite/wiki-properties';
 
-import {withTracks} from '#composite/things/album';
+import {withHasCoverArt, withTracks} from '#composite/things/album';
 import {withAlbum, withContinueCountingFrom, withStartCountingFrom}
   from '#composite/things/track-section';
 
@@ -64,9 +66,13 @@ export class Album extends Thing {
   static [Thing.referenceType] = 'album';
 
   static [Thing.getPropertyDescriptors] = ({
+    AdditionalFile,
+    AdditionalName,
     ArtTag,
+    Artwork,
+    CommentaryEntry,
+    CreditingSourcesEntry,
     Group,
-    Track,
     TrackSection,
     WikiInfo,
   }) => ({
@@ -91,10 +97,14 @@ export class Album extends Thing {
     alwaysReferenceTracksByDirectory: flag(false),
     suffixTrackDirectories: flag(false),
 
+    countTracksInArtistTotals: flag(true),
+
     color: color(),
     urls: urls(),
 
-    additionalNames: additionalNameList(),
+    additionalNames: thingList({
+      class: input.value(AdditionalName),
+    }),
 
     bandcampAlbumIdentifier: simpleString(),
     bandcampArtworkIdentifier: simpleString(),
@@ -104,16 +114,10 @@ export class Album extends Thing {
     dateAddedToWiki: simpleDate(),
 
     coverArtDate: [
-      // ~~TODO: Why does this fall back, but Track.coverArtDate doesn't?~~
-      // TODO: OK so it's because tracks don't *store* dates just like that.
-      // Really instead of fallback being a flag, it should be a date value,
-      // if this option is worth existing at all.
       withCoverArtDate({
         from: input.updateValue({
           validate: isDate,
         }),
-
-        fallback: input.value(true),
       }),
 
       exposeDependency({dependency: '#coverArtDate'}),
@@ -142,7 +146,11 @@ export class Album extends Thing {
     ],
 
     wallpaperParts: [
-      exitWithoutContribs({contribs: 'wallpaperArtistContribs'}),
+      exitWithoutContribs({
+        contribs: 'wallpaperArtistContribs',
+        value: input.value([]),
+      }),
+
       wallpaperParts(),
     ],
 
@@ -163,13 +171,56 @@ export class Album extends Thing {
       dimensions(),
     ],
 
+    wallpaperArtwork: [
+      exitWithoutDependency({
+        dependency: 'wallpaperArtistContribs',
+        mode: input.value('empty'),
+        value: input.value(null),
+      }),
+
+      constitutibleArtwork.fromYAMLFieldSpec
+        .call(this, 'Wallpaper Artwork'),
+    ],
+
+    bannerArtwork: [
+      exitWithoutDependency({
+        dependency: 'bannerArtistContribs',
+        mode: input.value('empty'),
+        value: input.value(null),
+      }),
+
+      constitutibleArtwork.fromYAMLFieldSpec
+        .call(this, 'Banner Artwork'),
+    ],
+
+    coverArtworks: [
+      withHasCoverArt(),
+
+      exitWithoutDependency({
+        dependency: '#hasCoverArt',
+        mode: input.value('falsy'),
+        value: input.value([]),
+      }),
+
+      constitutibleArtworkList.fromYAMLFieldSpec
+        .call(this, 'Cover Artwork'),
+    ],
+
     hasTrackNumbers: flag(true),
     isListedOnHomepage: flag(true),
     isListedInGalleries: flag(true),
 
-    commentary: commentary(),
-    creditSources: commentary(),
-    additionalFiles: additionalFiles(),
+    commentary: thingList({
+      class: input.value(CommentaryEntry),
+    }),
+
+    creditingSources: thingList({
+      class: input.value(CreditingSourcesEntry),
+    }),
+
+    additionalFiles: thingList({
+      class: input.value(AdditionalFile),
+    }),
 
     trackSections: thingList({
       class: input.value(TrackSection),
@@ -181,9 +232,7 @@ export class Album extends Thing {
     }),
 
     coverArtistContribs: [
-      withCoverArtDate({
-        fallback: input.value(true),
-      }),
+      withCoverArtDate(),
 
       contributionList({
         date: '#coverArtDate',
@@ -202,9 +251,7 @@ export class Album extends Thing {
     }),
 
     wallpaperArtistContribs: [
-      withCoverArtDate({
-        fallback: input.value(true),
-      }),
+      withCoverArtDate(),
 
       contributionList({
         date: '#coverArtDate',
@@ -213,9 +260,7 @@ export class Album extends Thing {
     ],
 
     bannerArtistContribs: [
-      withCoverArtDate({
-        fallback: input.value(true),
-      }),
+      withCoverArtDate(),
 
       contributionList({
         date: '#coverArtDate',
@@ -246,20 +291,7 @@ export class Album extends Thing {
         value: input.value([]),
       }),
 
-      {
-        dependencies: ['coverArtDate', 'date'],
-        compute: (continuation, {
-          coverArtDate,
-          date,
-        }) => continuation({
-          ['#date']:
-            coverArtDate ?? date,
-        }),
-      },
-
-      referencedArtworkList({
-        date: '#date',
-      }),
+      referencedArtworkList(),
     ],
 
     // Update only
@@ -268,13 +300,8 @@ export class Album extends Thing {
     reverse: soupyReverse(),
 
     // used for referencedArtworkList (mixedFind)
-    albumData: wikiData({
-      class: input.value(Album),
-    }),
-
-    // used for referencedArtworkList (mixedFind)
-    trackData: wikiData({
-      class: input.value(Track),
+    artworkData: wikiData({
+      class: input.value(Artwork),
     }),
 
     // used for withMatchingContributionPresets (indirectly by Contribution)
@@ -286,7 +313,11 @@ export class Album extends Thing {
 
     commentatorArtists: commentatorArtists(),
 
-    hasCoverArt: contribsPresent({contribs: 'coverArtistContribs'}),
+    hasCoverArt: [
+      withHasCoverArt(),
+      exposeDependency({dependency: '#hasCoverArt'}),
+    ],
+
     hasWallpaperArt: contribsPresent({contribs: 'wallpaperArtistContribs'}),
     hasBannerArt: contribsPresent({contribs: 'bannerArtistContribs'}),
 
@@ -294,17 +325,6 @@ export class Album extends Thing {
       withTracks(),
       exposeDependency({dependency: '#tracks'}),
     ],
-
-    referencedByArtworks: [
-      exitWithoutContribs({
-        contribs: 'coverArtistContribs',
-        value: input.value([]),
-      }),
-
-      reverseReferenceList({
-        reverse: soupyReverse.input('artworksWhichReference'),
-      }),
-    ],
   });
 
   static [Thing.getSerializeDescriptors] = ({
@@ -380,6 +400,31 @@ export class Album extends Thing {
           ? [] 
           : [album.name]),
     },
+
+    albumPrimaryArtwork: {
+      [Thing.findThisThingOnly]: false,
+
+      referenceTypes: [
+        'album',
+        'album-referencing-artworks',
+        'album-referenced-artworks',
+      ],
+
+      bindTo: 'artworkData',
+
+      include: (artwork, {Artwork, Album}) =>
+        artwork instanceof Artwork &&
+        artwork.thing instanceof Album &&
+        artwork === artwork.thing.coverArtworks[0],
+
+      getMatchableNames: ({thing: album}) =>
+        (album.alwaysReferenceByDirectory
+          ? []
+          : [album.name]),
+
+      getMatchableDirectories: ({thing: album}) =>
+        [album.directory],
+    },
   };
 
   static [Thing.reverseSpecs] = {
@@ -415,13 +460,13 @@ export class Album extends Thing {
       soupyReverse.contributionsBy('albumData', 'artistContribs'),
 
     albumCoverArtistContributionsBy:
-      soupyReverse.contributionsBy('albumData', 'coverArtistContribs'),
+      soupyReverse.artworkContributionsBy('albumData', 'coverArtworks'),
 
     albumWallpaperArtistContributionsBy:
-      soupyReverse.contributionsBy('albumData', 'wallpaperArtistContribs'),
+      soupyReverse.artworkContributionsBy('albumData', 'wallpaperArtwork', {single: true}),
 
     albumBannerArtistContributionsBy:
-      soupyReverse.contributionsBy('albumData', 'bannerArtistContribs'),
+      soupyReverse.artworkContributionsBy('albumData', 'bannerArtwork', {single: true}),
 
     albumsWithCommentaryBy: {
       bindTo: 'albumData',
@@ -459,6 +504,8 @@ export class Album extends Thing {
         transform: String,
       },
 
+      'Count Tracks In Artist Totals': {property: 'countInArtistTotals'},
+
       'Date': {
         property: 'date',
         transform: parseDate,
@@ -471,6 +518,49 @@ export class Album extends Thing {
       'Listed on Homepage': {property: 'isListedOnHomepage'},
       'Listed in Galleries': {property: 'isListedInGalleries'},
 
+      'Cover Artwork': {
+        property: 'coverArtworks',
+        transform:
+          parseArtwork({
+            thingProperty: 'coverArtworks',
+            dimensionsFromThingProperty: 'coverArtDimensions',
+            fileExtensionFromThingProperty: 'coverArtFileExtension',
+            dateFromThingProperty: 'coverArtDate',
+            artistContribsFromThingProperty: 'coverArtistContribs',
+            artistContribsArtistProperty: 'albumCoverArtistContributions',
+            artTagsFromThingProperty: 'artTags',
+            referencedArtworksFromThingProperty: 'referencedArtworks',
+          }),
+      },
+
+      'Banner Artwork': {
+        property: 'bannerArtwork',
+        transform:
+          parseArtwork({
+            single: true,
+            thingProperty: 'bannerArtwork',
+            dimensionsFromThingProperty: 'bannerDimensions',
+            fileExtensionFromThingProperty: 'bannerFileExtension',
+            dateFromThingProperty: 'date',
+            artistContribsFromThingProperty: 'bannerArtistContribs',
+            artistContribsArtistProperty: 'albumBannerArtistContributions',
+          }),
+      },
+
+      'Wallpaper Artwork': {
+        property: 'wallpaperArtwork',
+        transform:
+          parseArtwork({
+            single: true,
+            thingProperty: 'wallpaperArtwork',
+            dimensionsFromThingProperty: null,
+            fileExtensionFromThingProperty: 'wallpaperFileExtension',
+            dateFromThingProperty: 'date',
+            artistContribsFromThingProperty: 'wallpaperArtistContribs',
+            artistContribsArtistProperty: 'albumWallpaperArtistContributions',
+          }),
+      },
+
       'Cover Art Date': {
         property: 'coverArtDate',
         transform: parseDate,
@@ -504,9 +594,10 @@ export class Album extends Thing {
         transform: parseContributors,
       },
 
-      'Wallpaper Style': {property: 'wallpaperStyle'},
       'Wallpaper File Extension': {property: 'wallpaperFileExtension'},
 
+      'Wallpaper Style': {property: 'wallpaperStyle'},
+
       'Wallpaper Parts': {
         property: 'wallpaperParts',
         transform: parseWallpaperParts,
@@ -525,8 +616,15 @@ export class Album extends Thing {
         transform: parseDimensions,
       },
 
-      'Commentary': {property: 'commentary'},
-      'Credit Sources': {property: 'creditSources'},
+      'Commentary': {
+        property: 'commentary',
+        transform: parseCommentary,
+      },
+
+      'Crediting Sources': {
+        property: 'creditingSources',
+        transform: parseCreditingSources,
+      },
 
       'Additional Files': {
         property: 'additionalFiles',
@@ -598,6 +696,12 @@ export class Album extends Thing {
       const trackSectionData = [];
       const trackData = [];
 
+      const artworkData = [];
+      const commentaryData = [];
+      const creditingSourceData = [];
+      const referencingSourceData = [];
+      const lyricsData = [];
+
       for (const {header: album, entries} of results) {
         const trackSections = [];
 
@@ -609,8 +713,6 @@ export class Album extends Thing {
           isDefaultTrackSection: true,
         });
 
-        const albumRef = Thing.getReference(album);
-
         const closeCurrentTrackSection = () => {
           if (
             currentTrackSection.isDefaultTrackSection &&
@@ -637,17 +739,53 @@ export class Album extends Thing {
           currentTrackSectionTracks.push(entry);
           trackData.push(entry);
 
-          entry.dataSourceAlbum = albumRef;
+          // Set the track's album before accessing its list of artworks.
+          // The existence of its artwork objects may depend on access to
+          // its album's 'Default Track Cover Artists'.
+          entry.album = album;
+
+          artworkData.push(...entry.trackArtworks);
+          commentaryData.push(...entry.commentary);
+          creditingSourceData.push(...entry.creditingSources);
+          referencingSourceData.push(...entry.referencingSources);
+
+          // TODO: As exposed, Track.lyrics tries to inherit from the main
+          // release, which is impossible before the data's been linked.
+          // We just use the update value here. But it's icky!
+          lyricsData.push(...CacheableObject.getUpdateValue(entry, 'lyrics') ?? []);
         }
 
         closeCurrentTrackSection();
 
         albumData.push(album);
 
+        artworkData.push(...album.coverArtworks);
+
+        if (album.bannerArtwork) {
+          artworkData.push(album.bannerArtwork);
+        }
+
+        if (album.wallpaperArtwork) {
+          artworkData.push(album.wallpaperArtwork);
+        }
+
+        commentaryData.push(...album.commentary);
+        creditingSourceData.push(...album.creditingSources);
+
         album.trackSections = trackSections;
       }
 
-      return {albumData, trackSectionData, trackData};
+      return {
+        albumData,
+        trackSectionData,
+        trackData,
+
+        artworkData,
+        commentaryData,
+        creditingSourceData,
+        referencingSourceData,
+        lyricsData,
+      };
     },
 
     sort({albumData, trackData}) {
@@ -655,13 +793,65 @@ export class Album extends Thing {
       sortAlbumsTracksChronologically(trackData);
     },
   });
+
+  getOwnAdditionalFilePath(_file, filename) {
+    return [
+      'media.albumAdditionalFile',
+      this.directory,
+      filename,
+    ];
+  }
+
+  getOwnArtworkPath(artwork) {
+    if (artwork === this.bannerArtwork) {
+      return [
+        'media.albumBanner',
+        this.directory,
+        artwork.fileExtension,
+      ];
+    }
+
+    if (artwork === this.wallpaperArtwork) {
+      if (!empty(this.wallpaperParts)) {
+        return null;
+      }
+
+      return [
+        'media.albumWallpaper',
+        this.directory,
+        artwork.fileExtension,
+      ];
+    }
+
+    // TODO: using trackCover here is obviously, badly wrong
+    // but we ought to refactor banners and wallpapers similarly
+    // (i.e. depend on those intrinsic artwork paths rather than
+    // accessing media.{albumBanner,albumWallpaper} from content
+    // or other code directly)
+    return [
+      'media.trackCover',
+      this.directory,
+
+      (artwork.unqualifiedDirectory
+        ? 'cover-' + artwork.unqualifiedDirectory
+        : 'cover'),
+
+      artwork.fileExtension,
+    ];
+  }
+
+  // As of writing, albums don't even have a `duration` property...
+  // so this function will never be called... but the message stands...
+  countOwnContributionInDurationTotals(_contrib) {
+    return false;
+  }
 }
 
 export class TrackSection extends Thing {
   static [Thing.friendlyName] = `Track Section`;
   static [Thing.referenceType] = `track-section`;
 
-  static [Thing.getPropertyDescriptors] = ({Album, Track}) => ({
+  static [Thing.getPropertyDescriptors] = ({Track}) => ({
     // Update & expose
 
     name: name('Unnamed Track Section'),
@@ -790,11 +980,13 @@ export class TrackSection extends Thing {
 
     parts.push(Thing.prototype[inspect.custom].apply(this));
 
-    if (depth >= 0) {
+    if (depth >= 0) showAlbum: {
       let album = null;
       try {
         album = this.album;
-      } catch {}
+      } catch {
+        break showAlbum;
+      }
 
       let first = null;
       try {
@@ -806,22 +998,20 @@ export class TrackSection extends Thing {
         last = this.tracks.at(-1).trackNumber;
       } catch {}
 
-      if (album) {
-        const albumName = album.name;
-        const albumIndex = album.trackSections.indexOf(this);
+      const albumName = album.name;
+      const albumIndex = album.trackSections.indexOf(this);
 
-        const num =
-          (albumIndex === -1
-            ? 'indeterminate position'
-            : `#${albumIndex + 1}`);
+      const num =
+        (albumIndex === -1
+          ? 'indeterminate position'
+          : `#${albumIndex + 1}`);
 
-        const range =
-          (albumIndex >= 0 && first !== null && last !== null
-            ? `: ${first}-${last}`
-            : '');
+      const range =
+        (albumIndex >= 0 && first !== null && last !== null
+          ? `: ${first}-${last}`
+          : '');
 
-        parts.push(` (${colors.yellow(num + range)} in ${colors.green(albumName)})`);
-      }
+      parts.push(` (${colors.yellow(num + range)} in ${colors.green(`"${albumName}"`)})`);
     }
 
     return parts.join('');
diff --git a/src/data/things/art-tag.js b/src/data/things/art-tag.js
index c88fcdc2..518f616b 100644
--- a/src/data/things/art-tag.js
+++ b/src/data/things/art-tag.js
@@ -1,8 +1,7 @@
 export const ART_TAG_DATA_FILE = 'tags.yaml';
 
 import {input} from '#composite';
-import find from '#find';
-import {sortAlphabetically, sortAlbumsTracksChronologically} from '#sort';
+import {sortAlphabetically} from '#sort';
 import Thing from '#thing';
 import {unique} from '#sugar';
 import {isName} from '#validators';
@@ -12,7 +11,6 @@ import {exitWithoutDependency, exposeDependency, exposeUpdateValueOrContinue}
   from '#composite/control-flow';
 
 import {
-  additionalNameList,
   annotatedReferenceList,
   color,
   contentString,
@@ -23,8 +21,8 @@ import {
   name,
   soupyFind,
   soupyReverse,
+  thingList,
   urls,
-  wikiData,
 } from '#composite/wiki-properties';
 
 import {withAllDescendantArtTags, withAncestorArtTagBaobabTree}
@@ -34,7 +32,7 @@ export class ArtTag extends Thing {
   static [Thing.referenceType] = 'tag';
   static [Thing.friendlyName] = `Art Tag`;
 
-  static [Thing.getPropertyDescriptors] = ({Album, Track}) => ({
+  static [Thing.getPropertyDescriptors] = ({AdditionalName}) => ({
     // Update & expose
 
     name: name('Unnamed Art Tag'),
@@ -55,7 +53,9 @@ export class ArtTag extends Thing {
       },
     ],
 
-    additionalNames: additionalNameList(),
+    additionalNames: thingList({
+      class: input.value(AdditionalName),
+    }),
 
     description: contentString(),
 
@@ -68,8 +68,6 @@ export class ArtTag extends Thing {
       class: input.value(ArtTag),
       find: soupyFind.input('artTag'),
 
-      date: input.value(null),
-
       reference: input.value('artTag'),
       thing: input.value('artTag'),
     }),
@@ -94,22 +92,11 @@ export class ArtTag extends Thing {
       },
     ],
 
-    directlyTaggedInThings: {
-      flags: {expose: true},
-
-      expose: {
-        dependencies: ['this', 'reverse'],
-        compute: ({this: artTag, reverse}) =>
-          sortAlbumsTracksChronologically(
-            [
-              ...reverse.albumsWhoseArtworksFeature(artTag),
-              ...reverse.tracksWhoseArtworksFeature(artTag),
-            ],
-            {getDate: thing => thing.coverArtDate ?? thing.date}),
-      },
-    },
+    directlyFeaturedInArtworks: reverseReferenceList({
+      reverse: soupyReverse.input('artworksWhichFeature'),
+    }),
 
-    indirectlyTaggedInThings: [
+    indirectlyFeaturedInArtworks: [
       withAllDescendantArtTags(),
 
       {
@@ -117,7 +104,7 @@ export class ArtTag extends Thing {
         compute: ({'#allDescendantArtTags': allDescendantArtTags}) =>
           unique(
             allDescendantArtTags
-              .flatMap(artTag => artTag.directlyTaggedInThings)),
+              .flatMap(artTag => artTag.directlyFeaturedInArtworks)),
       },
     ],
 
diff --git a/src/data/things/artist.js b/src/data/things/artist.js
index 7ed99a8e..5b67051c 100644
--- a/src/data/things/artist.js
+++ b/src/data/things/artist.js
@@ -10,8 +10,12 @@ import {stitchArrays} from '#sugar';
 import Thing from '#thing';
 import {isName, validateArrayItems} from '#validators';
 import {getKebabCase} from '#wiki-data';
+import {parseArtwork} from '#yaml';
+
+import {exitWithoutDependency} from '#composite/control-flow';
 
 import {
+  constitutibleArtwork,
   contentString,
   directory,
   fileExtension,
@@ -22,7 +26,6 @@ import {
   soupyFind,
   soupyReverse,
   urls,
-  wikiData,
 } from '#composite/wiki-properties';
 
 import {artistTotalDuration} from '#composite/things/artist';
@@ -31,7 +34,7 @@ export class Artist extends Thing {
   static [Thing.referenceType] = 'artist';
   static [Thing.wikiDataArray] = 'artistData';
 
-  static [Thing.getPropertyDescriptors] = ({Album, Flash, Group, Track}) => ({
+  static [Thing.getPropertyDescriptors] = () => ({
     // Update & expose
 
     name: name('Unnamed Artist'),
@@ -43,6 +46,16 @@ export class Artist extends Thing {
     hasAvatar: flag(false),
     avatarFileExtension: fileExtension('jpg'),
 
+    avatarArtwork: [
+      exitWithoutDependency({
+        dependency: 'hasAvatar',
+        value: input.value(null),
+      }),
+
+      constitutibleArtwork.fromYAMLFieldSpec
+        .call(this, 'Avatar Artwork'),
+    ],
+
     aliasNames: {
       flags: {update: true, expose: true},
       update: {validate: validateArrayItems(isName)},
@@ -193,6 +206,17 @@ export class Artist extends Thing {
       'URLs': {property: 'urls'},
       'Context Notes': {property: 'contextNotes'},
 
+      // note: doesn't really work as an independent field yet
+      'Avatar Artwork': {
+        property: 'avatarArtwork',
+        transform:
+          parseArtwork({
+            single: true,
+            thingProperty: 'avatarArtwork',
+            fileExtensionFromThingProperty: 'avatarFileExtension',
+          }),
+      },
+
       'Has Avatar': {property: 'hasAvatar'},
       'Avatar File Extension': {property: 'avatarFileExtension'},
 
@@ -238,7 +262,12 @@ export class Artist extends Thing {
 
       const artistData = [...artists, ...artistAliases];
 
-      return {artistData};
+      const artworkData =
+        artistData
+          .filter(artist => artist.hasAvatar)
+          .map(artist => artist.avatarArtwork);
+
+      return {artistData, artworkData};
     },
 
     sort({artistData}) {
@@ -257,7 +286,7 @@ export class Artist extends Thing {
       let aliasedArtist;
       try {
         aliasedArtist = this.aliasedArtist.name;
-      } catch (_error) {
+      } catch {
         aliasedArtist = CacheableObject.getUpdateValue(this, 'aliasedArtist');
       }
 
@@ -266,4 +295,12 @@ export class Artist extends Thing {
 
     return parts.join('');
   }
+
+  getOwnArtworkPath(artwork) {
+    return [
+      'media.artistAvatar',
+      this.directory,
+      artwork.fileExtension,
+    ];
+  }
 }
diff --git a/src/data/things/artwork.js b/src/data/things/artwork.js
new file mode 100644
index 00000000..57c293ca
--- /dev/null
+++ b/src/data/things/artwork.js
@@ -0,0 +1,510 @@
+import {inspect} from 'node:util';
+
+import {colors} from '#cli';
+import {input} from '#composite';
+import find from '#find';
+import Thing from '#thing';
+
+import {
+  isContentString,
+  isContributionList,
+  isDate,
+  isDimensions,
+  isFileExtension,
+  optional,
+  validateArrayItems,
+  validateProperties,
+  validateReference,
+  validateReferenceList,
+} from '#validators';
+
+import {
+  parseAnnotatedReferences,
+  parseContributors,
+  parseDate,
+  parseDimensions,
+} from '#yaml';
+
+import {withPropertyFromObject} from '#composite/data';
+
+import {
+  exitWithoutDependency,
+  exposeConstant,
+  exposeDependency,
+  exposeDependencyOrContinue,
+  exposeUpdateValueOrContinue,
+} from '#composite/control-flow';
+
+import {
+  withRecontextualizedContributionList,
+  withResolvedAnnotatedReferenceList,
+  withResolvedContribs,
+  withResolvedReferenceList,
+} from '#composite/wiki-data';
+
+import {
+  contentString,
+  directory,
+  flag,
+  reverseReferenceList,
+  simpleString,
+  soupyFind,
+  soupyReverse,
+  thing,
+  wikiData,
+} from '#composite/wiki-properties';
+
+import {
+  withAttachedArtwork,
+  withContainingArtworkList,
+  withContribsFromAttachedArtwork,
+  withPropertyFromAttachedArtwork,
+  withDate,
+} from '#composite/things/artwork';
+
+export class Artwork extends Thing {
+  static [Thing.referenceType] = 'artwork';
+
+  static [Thing.getPropertyDescriptors] = ({ArtTag}) => ({
+    // Update & expose
+
+    unqualifiedDirectory: directory({
+      name: input.value(null),
+    }),
+
+    thing: thing(),
+    thingProperty: simpleString(),
+
+    label: simpleString(),
+    source: contentString(),
+    originDetails: contentString(),
+
+    dateFromThingProperty: simpleString(),
+
+    date: [
+      withDate({
+        from: input.updateValue({validate: isDate}),
+      }),
+
+      exposeDependency({dependency: '#date'}),
+    ],
+
+    fileExtensionFromThingProperty: simpleString(),
+
+    fileExtension: [
+      {
+        compute: (continuation) => continuation({
+          ['#default']: 'jpg',
+        }),
+      },
+
+      exposeUpdateValueOrContinue({
+        validate: input.value(isFileExtension),
+      }),
+
+      exitWithoutDependency({
+        dependency: 'thing',
+        value: '#default',
+      }),
+
+      exitWithoutDependency({
+        dependency: 'fileExtensionFromThingProperty',
+        value: '#default',
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: 'fileExtensionFromThingProperty',
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#value',
+      }),
+
+      exposeDependency({
+        dependency: '#default',
+      }),
+    ],
+
+    dimensionsFromThingProperty: simpleString(),
+
+    dimensions: [
+      exposeUpdateValueOrContinue({
+        validate: input.value(isDimensions),
+      }),
+
+      exitWithoutDependency({
+        dependency: 'dimensionsFromThingProperty',
+        value: input.value(null),
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: 'dimensionsFromThingProperty',
+      }).outputs({
+        ['#value']: '#dimensionsFromThing',
+      }),
+
+      exitWithoutDependency({
+        dependency: 'dimensionsFromThingProperty',
+        value: input.value(null),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#dimensionsFromThing',
+      }),
+
+      exposeConstant({
+        value: input.value(null),
+      }),
+    ],
+
+    attachAbove: flag(false),
+
+    artistContribsFromThingProperty: simpleString(),
+    artistContribsArtistProperty: simpleString(),
+
+    artistContribs: [
+      withDate(),
+
+      withResolvedContribs({
+        from: input.updateValue({validate: isContributionList}),
+        date: '#date',
+        thingProperty: input.thisProperty(),
+        artistProperty: 'artistContribsArtistProperty',
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#resolvedContribs',
+        mode: input.value('empty'),
+      }),
+
+      withContribsFromAttachedArtwork(),
+
+      exposeDependencyOrContinue({
+        dependency: '#attachedArtwork.artistContribs',
+      }),
+
+      exitWithoutDependency({
+        dependency: 'artistContribsFromThingProperty',
+        value: input.value([]),
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: 'artistContribsFromThingProperty',
+      }).outputs({
+        ['#value']: '#artistContribs',
+      }),
+
+      withRecontextualizedContributionList({
+        list: '#artistContribs',
+      }),
+
+      exposeDependency({
+        dependency: '#artistContribs',
+      }),
+    ],
+
+    artTagsFromThingProperty: simpleString(),
+
+    artTags: [
+      withResolvedReferenceList({
+        list: input.updateValue({
+          validate:
+            validateReferenceList(ArtTag[Thing.referenceType]),
+        }),
+
+        find: soupyFind.input('artTag'),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#resolvedReferenceList',
+        mode: input.value('empty'),
+      }),
+
+      withPropertyFromAttachedArtwork({
+        property: input.value('artTags'),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#attachedArtwork.artTags',
+      }),
+
+      exitWithoutDependency({
+        dependency: 'artTagsFromThingProperty',
+        value: input.value([]),
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: 'artTagsFromThingProperty',
+      }).outputs({
+        ['#value']: '#artTags',
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#artTags',
+      }),
+
+      exposeConstant({
+        value: input.value([]),
+      }),
+    ],
+
+    referencedArtworksFromThingProperty: simpleString(),
+
+    referencedArtworks: [
+      {
+        compute: (continuation) => continuation({
+          ['#find']:
+            find.mixed({
+              track: find.trackPrimaryArtwork,
+              album: find.albumPrimaryArtwork,
+            }),
+        }),
+      },
+
+      withResolvedAnnotatedReferenceList({
+        list: input.updateValue({
+          validate:
+            // TODO: It's annoying to hardcode this when it's really the
+            // same behavior as through annotatedReferenceList and through
+            // referenceListUpdateDescription, the latter of which isn't
+            // available outside of #composite/wiki-data internals.
+            validateArrayItems(
+              validateProperties({
+                reference: validateReference(['album', 'track']),
+                annotation: optional(isContentString),
+              })),
+        }),
+
+        data: 'artworkData',
+        find: '#find',
+
+        thing: input.value('artwork'),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#resolvedAnnotatedReferenceList',
+        mode: input.value('empty'),
+      }),
+
+      exitWithoutDependency({
+        dependency: 'referencedArtworksFromThingProperty',
+        value: input.value([]),
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: 'referencedArtworksFromThingProperty',
+      }).outputs({
+        ['#value']: '#referencedArtworks',
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#referencedArtworks',
+      }),
+
+      exposeConstant({
+        value: input.value([]),
+      }),
+    ],
+
+    // Update only
+
+    find: soupyFind(),
+    reverse: soupyReverse(),
+
+    // used for referencedArtworks (mixedFind)
+    artworkData: wikiData({
+      class: input.value(Artwork),
+    }),
+
+    // Expose only
+
+    referencedByArtworks: reverseReferenceList({
+      reverse: soupyReverse.input('artworksWhichReference'),
+    }),
+
+    isMainArtwork: [
+      withContainingArtworkList(),
+
+      exitWithoutDependency({
+        dependency: '#containingArtworkList',
+        value: input.value(null),
+      }),
+
+      {
+        dependencies: [input.myself(), '#containingArtworkList'],
+        compute: ({
+          [input.myself()]: myself,
+          ['#containingArtworkList']: list,
+        }) =>
+          list[0] === myself,
+      },
+    ],
+
+    mainArtwork: [
+      withContainingArtworkList(),
+
+      exitWithoutDependency({
+        dependency: '#containingArtworkList',
+        value: input.value(null),
+      }),
+
+      {
+        dependencies: ['#containingArtworkList'],
+        compute: ({'#containingArtworkList': list}) =>
+          list[0],
+      },
+    ],
+
+    attachedArtwork: [
+      withAttachedArtwork(),
+
+      exposeDependency({
+        dependency: '#attachedArtwork',
+      }),
+    ],
+
+    attachingArtworks: reverseReferenceList({
+      reverse: soupyReverse.input('artworksWhichAttach'),
+    }),
+
+    groups: [
+      withPropertyFromObject({
+        object: 'thing',
+        property: input.value('groups'),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#thing.groups',
+      }),
+
+      exposeConstant({
+        value: input.value([]),
+      }),
+    ],
+  });
+
+  static [Thing.yamlDocumentSpec] = {
+    fields: {
+      'Directory': {property: 'unqualifiedDirectory'},
+      'File Extension': {property: 'fileExtension'},
+
+      'Dimensions': {
+        property: 'dimensions',
+        transform: parseDimensions,
+      },
+
+      'Label': {property: 'label'},
+      'Source': {property: 'source'},
+      'Origin Details': {property: 'originDetails'},
+
+      'Date': {
+        property: 'date',
+        transform: parseDate,
+      },
+
+      'Attach Above': {property: 'attachAbove'},
+
+      'Artists': {
+        property: 'artistContribs',
+        transform: parseContributors,
+      },
+
+      'Tags': {property: 'artTags'},
+
+      'Referenced Artworks': {
+        property: 'referencedArtworks',
+        transform: parseAnnotatedReferences,
+      },
+    },
+  };
+
+  static [Thing.reverseSpecs] = {
+    artworksWhichReference: {
+      bindTo: 'artworkData',
+
+      referencing: referencingArtwork =>
+        referencingArtwork.referencedArtworks
+          .map(({artwork: referencedArtwork, ...referenceDetails}) => ({
+            referencingArtwork,
+            referencedArtwork,
+            referenceDetails,
+          })),
+
+      referenced: ({referencedArtwork}) => [referencedArtwork],
+
+      tidy: ({referencingArtwork, referenceDetails}) => ({
+        artwork: referencingArtwork,
+        ...referenceDetails,
+      }),
+
+      date: ({artwork}) => artwork.date,
+    },
+
+    artworksWhichAttach: {
+      bindTo: 'artworkData',
+
+      referencing: referencingArtwork =>
+        (referencingArtwork.attachAbove
+          ? [referencingArtwork]
+          : []),
+
+      referenced: referencingArtwork =>
+        [referencingArtwork.attachedArtwork],
+    },
+
+    artworksWhichFeature: {
+      bindTo: 'artworkData',
+
+      referencing: artwork => [artwork],
+      referenced: artwork => artwork.artTags,
+    },
+  };
+
+  get path() {
+    if (!this.thing) return null;
+    if (!this.thing.getOwnArtworkPath) return null;
+
+    return this.thing.getOwnArtworkPath(this);
+  }
+
+  countOwnContributionInContributionTotals(contrib) {
+    if (this.attachAbove) {
+      return false;
+    }
+
+    if (contrib.annotation?.startsWith('edits for wiki')) {
+      return false;
+    }
+
+    return true;
+  }
+
+  [inspect.custom](depth, options, inspect) {
+    const parts = [];
+
+    parts.push(Thing.prototype[inspect.custom].apply(this));
+
+    if (this.thing) {
+      if (depth >= 0) {
+        const newOptions = {
+          ...options,
+          depth:
+            (options.depth === null
+              ? null
+              : options.depth - 1),
+        };
+
+        parts.push(` for ${inspect(this.thing, newOptions)}`);
+      } else {
+        parts.push(` for ${colors.blue(Thing.getReference(this.thing))}`);
+      }
+    }
+
+    return parts.join('');
+  }
+}
diff --git a/src/data/things/content.js b/src/data/things/content.js
new file mode 100644
index 00000000..ca41ccaa
--- /dev/null
+++ b/src/data/things/content.js
@@ -0,0 +1,205 @@
+import {input} from '#composite';
+import Thing from '#thing';
+import {is, isDate} from '#validators';
+import {parseDate} from '#yaml';
+
+import {contentString, simpleDate, soupyFind, thing}
+  from '#composite/wiki-properties';
+
+import {
+  exitWithoutDependency,
+  exposeConstant,
+  exposeDependency,
+  exposeDependencyOrContinue,
+  exposeUpdateValueOrContinue,
+  withResultOfAvailabilityCheck,
+} from '#composite/control-flow';
+
+import {
+  contentArtists,
+  hasAnnotationPart,
+  withAnnotationParts,
+  withHasAnnotationPart,
+  withSourceText,
+  withSourceURLs,
+  withWebArchiveDate,
+} from '#composite/things/content';
+
+export class ContentEntry extends Thing {
+  static [Thing.getPropertyDescriptors] = () => ({
+    // Update & expose
+
+    thing: thing(),
+
+    artists: contentArtists(),
+
+    artistText: contentString(),
+
+    annotation: contentString(),
+
+    dateKind: {
+      flags: {update: true, expose: true},
+
+      update: {
+        validate: is(...[
+          'sometime',
+          'throughout',
+          'around',
+        ]),
+      },
+    },
+
+    accessKind: [
+      exitWithoutDependency({
+        dependency: 'accessDate',
+      }),
+
+      exposeUpdateValueOrContinue({
+        validate: input.value(
+          is(...[
+            'captured',
+            'accessed',
+          ])),
+      }),
+
+      withWebArchiveDate(),
+
+      withResultOfAvailabilityCheck({
+        from: '#webArchiveDate',
+      }),
+
+      {
+        dependencies: ['#availability'],
+        compute: (continuation, {['#availability']: availability}) =>
+          (availability
+            ? continuation.exit('captured')
+            : continuation()),
+      },
+
+      exposeConstant({
+        value: input.value('accessed'),
+      }),
+    ],
+
+    date: simpleDate(),
+
+    secondDate: simpleDate(),
+
+    accessDate: [
+      exposeUpdateValueOrContinue({
+        validate: input.value(isDate),
+      }),
+
+      withWebArchiveDate(),
+
+      exposeDependencyOrContinue({
+        dependency: '#webArchiveDate',
+      }),
+
+      exposeConstant({
+        value: input.value(null),
+      }),
+    ],
+
+    body: contentString(),
+
+    // Update only
+
+    find: soupyFind(),
+
+    // Expose only
+
+    annotationParts: [
+      withAnnotationParts({
+        mode: input.value('strings'),
+      }),
+
+      exposeDependency({dependency: '#annotationParts'}),
+    ],
+
+    sourceText: [
+      withSourceText(),
+      exposeDependency({dependency: '#sourceText'}),
+    ],
+
+    sourceURLs: [
+      withSourceURLs(),
+      exposeDependency({dependency: '#sourceURLs'}),
+    ],
+  });
+
+  static [Thing.yamlDocumentSpec] = {
+    fields: {
+      'Artists': {property: 'artists'},
+      'Artist Text': {property: 'artistText'},
+
+      'Annotation': {property: 'annotation'},
+
+      'Date Kind': {property: 'dateKind'},
+      'Access Kind': {property: 'accessKind'},
+
+      'Date': {property: 'date', transform: parseDate},
+      'Second Date': {property: 'secondDate', transform: parseDate},
+      'Access Date': {property: 'accessDate', transform: parseDate},
+
+      'Body': {property: 'body'},
+    },
+  };
+}
+
+export class CommentaryEntry extends ContentEntry {
+  static [Thing.getPropertyDescriptors] = () => ({
+    // Expose only
+
+    isWikiEditorCommentary: hasAnnotationPart({
+      part: input.value('wiki editor'),
+    }),
+  });
+}
+
+export class LyricsEntry extends ContentEntry {
+  static [Thing.getPropertyDescriptors] = () => ({
+    // Update & expose
+
+    originDetails: contentString(),
+
+    // Expose only
+
+    isWikiLyrics: hasAnnotationPart({
+      part: input.value('wiki lyrics'),
+    }),
+
+    hasSquareBracketAnnotations: [
+      withHasAnnotationPart({
+        part: input.value('wiki lyrics'),
+      }),
+
+      exitWithoutDependency({
+        dependency: '#hasAnnotationPart',
+        mode: input.value('falsy'),
+        value: input.value(false),
+      }),
+
+      exitWithoutDependency({
+        dependency: 'body',
+        value: input.value(false),
+      }),
+
+      {
+        dependencies: ['body'],
+        compute: ({body}) =>
+          /\[.*\]/m.test(body),
+      },
+    ],
+  });
+
+  static [Thing.yamlDocumentSpec] = Thing.extendDocumentSpec(ContentEntry, {
+    fields: {
+      'Origin Details': {property: 'originDetails'},
+    },
+  });
+}
+
+export class CreditingSourcesEntry extends ContentEntry {}
+
+export class ReferencingSourcesEntry extends ContentEntry {}
diff --git a/src/data/things/contribution.js b/src/data/things/contribution.js
index c92fafb4..90e8eb79 100644
--- a/src/data/things/contribution.js
+++ b/src/data/things/contribution.js
@@ -5,12 +5,20 @@ import {colors} from '#cli';
 import {input} from '#composite';
 import {empty} from '#sugar';
 import Thing from '#thing';
-import {isStringNonEmpty, isThing, validateReference} from '#validators';
+import {isBoolean, isStringNonEmpty, isThing, validateReference}
+  from '#validators';
 
-import {exitWithoutDependency, exposeDependency} from '#composite/control-flow';
 import {flag, simpleDate, soupyFind} from '#composite/wiki-properties';
 
 import {
+  exitWithoutDependency,
+  exposeConstant,
+  exposeDependency,
+  exposeDependencyOrContinue,
+  exposeUpdateValueOrContinue,
+} from '#composite/control-flow';
+
+import {
   withFilteredList,
   withNearbyItemFromList,
   withPropertyFromList,
@@ -70,7 +78,26 @@ export class Contribution extends Thing {
         property: input.thisProperty(),
       }),
 
-      flag(true),
+      exposeUpdateValueOrContinue({
+        validate: input.value(isBoolean),
+      }),
+
+      {
+        dependencies: ['thing', input.myself()],
+        compute: (continuation, {
+          ['thing']: thing,
+          [input.myself()]: contribution,
+        }) =>
+          (thing.countOwnContributionInContributionTotals?.(contribution)
+            ? true
+         : thing.countOwnContributionInContributionTotals
+            ? false
+            : continuation()),
+      },
+
+      exposeConstant({
+        value: input.value(true),
+      }),
     ],
 
     countInDurationTotals: [
@@ -78,7 +105,37 @@ export class Contribution extends Thing {
         property: input.thisProperty(),
       }),
 
-      flag(true),
+      exposeUpdateValueOrContinue({
+        validate: input.value(isBoolean),
+      }),
+
+      withPropertyFromObject({
+        object: 'thing',
+        property: input.value('duration'),
+      }),
+
+      exitWithoutDependency({
+        dependency: '#thing.duration',
+        mode: input.value('falsy'),
+        value: input.value(false),
+      }),
+
+      {
+        dependencies: ['thing', input.myself()],
+        compute: (continuation, {
+          ['thing']: thing,
+          [input.myself()]: contribution,
+        }) =>
+          (thing.countOwnContributionInDurationTotals?.(contribution)
+            ? true
+         : thing.countOwnContributionInDurationTotals
+            ? false
+            : continuation()),
+      },
+
+      exposeConstant({
+        value: input.value(true),
+      }),
     ],
 
     // Update only
@@ -238,6 +295,21 @@ export class Contribution extends Thing {
         dependency: '#nearbyItem',
       }),
     ],
+
+    groups: [
+      withPropertyFromObject({
+        object: 'thing',
+        property: input.value('groups'),
+      }),
+
+      exposeDependencyOrContinue({
+        dependency: '#thing.groups',
+      }),
+
+      exposeConstant({
+        value: input.value([]),
+      }),
+    ],
   });
 
   [inspect.custom](depth, options, inspect) {
@@ -259,7 +331,7 @@ export class Contribution extends Thing {
       let artist;
       try {
         artist = this.artist;
-      } catch (_error) {
+      } catch {
         // Computing artist might crash for any reason - don't distract from
         // other errors as a result of inspecting this contribution.
       }
diff --git a/src/data/things/flash.js b/src/data/things/flash.js
index fe1d17ff..160221f0 100644
--- a/src/data/things/flash.js
+++ b/src/data/things/flash.js
@@ -6,8 +6,16 @@ import {sortFlashesChronologically} from '#sort';
 import Thing from '#thing';
 import {anyOf, isColor, isContentString, isDirectory, isNumber, isString}
   from '#validators';
-import {parseAdditionalNames, parseContributors, parseDate, parseDimensions}
-  from '#yaml';
+
+import {
+  parseArtwork,
+  parseAdditionalNames,
+  parseCommentary,
+  parseContributors,
+  parseCreditingSources,
+  parseDate,
+  parseDimensions,
+} from '#yaml';
 
 import {withPropertyFromObject} from '#composite/data';
 
@@ -19,10 +27,9 @@ import {
 } from '#composite/control-flow';
 
 import {
-  additionalNameList,
   color,
-  commentary,
   commentatorArtists,
+  constitutibleArtwork,
   contentString,
   contributionList,
   dimensions,
@@ -34,8 +41,8 @@ import {
   soupyFind,
   soupyReverse,
   thing,
+  thingList,
   urls,
-  wikiData,
 } from '#composite/wiki-properties';
 
 import {withFlashAct} from '#composite/things/flash';
@@ -45,8 +52,10 @@ export class Flash extends Thing {
   static [Thing.referenceType] = 'flash';
 
   static [Thing.getPropertyDescriptors] = ({
+    AdditionalName,
+    CommentaryEntry,
+    CreditingSourcesEntry,
     Track,
-    FlashAct,
     WikiInfo,
   }) => ({
     // Update & expose
@@ -100,6 +109,10 @@ export class Flash extends Thing {
 
     coverArtDimensions: dimensions(),
 
+    coverArtwork:
+      constitutibleArtwork.fromYAMLFieldSpec
+        .call(this, 'Cover Artwork'),
+
     contributorContribs: contributionList({
       date: 'date',
       artistProperty: input.value('flashContributorContributions'),
@@ -112,10 +125,17 @@ export class Flash extends Thing {
 
     urls: urls(),
 
-    additionalNames: additionalNameList(),
+    additionalNames: thingList({
+      class: input.value(AdditionalName),
+    }),
+
+    commentary: thingList({
+      class: input.value(CommentaryEntry),
+    }),
 
-    commentary: commentary(),
-    creditSources: commentary(),
+    creditingSources: thingList({
+      class: input.value(CreditingSourcesEntry),
+    }),
 
     // Update only
 
@@ -205,6 +225,17 @@ export class Flash extends Thing {
         transform: parseAdditionalNames,
       },
 
+      'Cover Artwork': {
+        property: 'coverArtwork',
+        transform:
+          parseArtwork({
+            single: true,
+            thingProperty: 'coverArtwork',
+            fileExtensionFromThingProperty: 'coverArtFileExtension',
+            dimensionsFromThingProperty: 'coverArtDimensions',
+          }),
+      },
+
       'Cover Art File Extension': {property: 'coverArtFileExtension'},
 
       'Cover Art Dimensions': {
@@ -219,12 +250,27 @@ export class Flash extends Thing {
         transform: parseContributors,
       },
 
-      'Commentary': {property: 'commentary'},
-      'Credit Sources': {property: 'creditSources'},
+      'Commentary': {
+        property: 'commentary',
+        transform: parseCommentary,
+      },
+
+      'Crediting Sources': {
+        property: 'creditingSources',
+        transform: parseCreditingSources,
+      },
 
       'Review Points': {ignore: true},
     },
   };
+
+  getOwnArtworkPath(artwork) {
+    return [
+      'media.flashArt',
+      this.directory,
+      artwork.fileExtension,
+    ];
+  }
 }
 
 export class FlashAct extends Thing {
@@ -411,7 +457,19 @@ export class FlashSide extends Thing {
       const flashActData = results.filter(x => x instanceof FlashAct);
       const flashSideData = results.filter(x => x instanceof FlashSide);
 
-      return {flashData, flashActData, flashSideData};
+      const artworkData = flashData.map(flash => flash.coverArtwork);
+      const commentaryData = flashData.flatMap(flash => flash.commentary);
+      const creditingSourceData = flashData.flatMap(flash => flash.creditingSources);
+
+      return {
+        flashData,
+        flashActData,
+        flashSideData,
+
+        artworkData,
+        commentaryData,
+        creditingSourceData,
+      };
     },
 
     sort({flashData}) {
diff --git a/src/data/things/group.js b/src/data/things/group.js
index ed3c59bb..0262a3a5 100644
--- a/src/data/things/group.js
+++ b/src/data/things/group.js
@@ -1,7 +1,11 @@
 export const GROUP_DATA_FILE = 'groups.yaml';
 
+import {inspect} from 'node:util';
+
+import {colors} from '#cli';
 import {input} from '#composite';
 import Thing from '#thing';
+import {is} from '#validators';
 import {parseAnnotatedReferences, parseSerieses} from '#yaml';
 
 import {
@@ -11,16 +15,16 @@ import {
   directory,
   name,
   referenceList,
-  seriesList,
   soupyFind,
+  thing,
+  thingList,
   urls,
-  wikiData,
 } from '#composite/wiki-properties';
 
 export class Group extends Thing {
   static [Thing.referenceType] = 'group';
 
-  static [Thing.getPropertyDescriptors] = ({Album, Artist}) => ({
+  static [Thing.getPropertyDescriptors] = ({Album, Artist, Series}) => ({
     // Update & expose
 
     name: name('Unnamed Group'),
@@ -34,8 +38,6 @@ export class Group extends Thing {
       class: input.value(Artist),
       find: soupyFind.input('artist'),
 
-      date: input.value(null),
-
       reference: input.value('artist'),
       thing: input.value('artist'),
     }),
@@ -45,8 +47,8 @@ export class Group extends Thing {
       find: soupyFind.input('album'),
     }),
 
-    serieses: seriesList({
-      group: input.myself(),
+    serieses: thingList({
+      class: input.value(Series),
     }),
 
     // Update only
@@ -194,8 +196,9 @@ export class Group extends Thing {
 
       const groupData = results.filter(x => x instanceof Group);
       const groupCategoryData = results.filter(x => x instanceof GroupCategory);
+      const seriesData = groupData.flatMap(group => group.serieses);
 
-      return {groupData, groupCategoryData};
+      return {groupData, groupCategoryData, seriesData};
     },
 
     // Groups aren't sorted at all, always preserving the order in the data
@@ -242,3 +245,73 @@ export class GroupCategory extends Thing {
     },
   };
 }
+
+export class Series extends Thing {
+  static [Thing.getPropertyDescriptors] = ({Album, Group}) => ({
+    // Update & expose
+
+    name: name('Unnamed Series'),
+
+    showAlbumArtists: {
+      flags: {update: true, expose: true},
+      update: {
+        validate:
+          is('all', 'differing', 'none'),
+      },
+    },
+
+    description: contentString(),
+
+    group: thing({
+      class: input.value(Group),
+    }),
+
+    albums: referenceList({
+      class: input.value(Album),
+      find: soupyFind.input('album'),
+    }),
+
+    // Update only
+
+    find: soupyFind(),
+  });
+
+  static [Thing.yamlDocumentSpec] = {
+    fields: {
+      'Name': {property: 'name'},
+
+      'Description': {property: 'description'},
+
+      'Show Album Artists': {property: 'showAlbumArtists'},
+
+      'Albums': {property: 'albums'},
+    },
+  };
+
+  [inspect.custom](depth, options, inspect) {
+    const parts = [];
+
+    parts.push(Thing.prototype[inspect.custom].apply(this));
+
+    if (depth >= 0) showGroup: {
+      let group = null;
+      try {
+        group = this.group;
+      } catch {
+        break showGroup;
+      }
+
+      const groupName = group.name;
+      const groupIndex = group.serieses.indexOf(this);
+
+      const num =
+        (groupIndex === -1
+          ? 'indeterminate position'
+          : `#${groupIndex + 1}`);
+
+      parts.push(` (${colors.yellow(num)} in ${colors.green(`"${groupName}"`)})`);
+    }
+
+    return parts.join('');
+  }
+}
diff --git a/src/data/things/homepage-layout.js b/src/data/things/homepage-layout.js
index 82bad2d3..3a11c287 100644
--- a/src/data/things/homepage-layout.js
+++ b/src/data/things/homepage-layout.js
@@ -63,7 +63,6 @@ export class HomepageLayout extends Thing {
     thingConstructors: {
       HomepageLayout,
       HomepageLayoutSection,
-      HomepageLayoutAlbumsRow,
     },
   }) => ({
     title: `Process homepage layout file`,
@@ -250,7 +249,7 @@ export class HomepageLayoutActionsRow extends HomepageLayoutRow {
 export class HomepageLayoutAlbumCarouselRow extends HomepageLayoutRow {
   static [Thing.friendlyName] = `Homepage Album Carousel Row`;
 
-  static [Thing.getPropertyDescriptors] = (opts, {Album, Group} = opts) => ({
+  static [Thing.getPropertyDescriptors] = (opts, {Album} = opts) => ({
     ...HomepageLayoutRow[Thing.getPropertyDescriptors](opts),
 
     // Update & expose
diff --git a/src/data/things/index.js b/src/data/things/index.js
index 17471f31..11307b50 100644
--- a/src/data/things/index.js
+++ b/src/data/things/index.js
@@ -9,9 +9,13 @@ import * as serialize from '#serialize';
 import {withEntries} from '#sugar';
 import Thing from '#thing';
 
+import * as additionalFileClasses from './additional-file.js';
+import * as additionalNameClasses from './additional-name.js';
 import * as albumClasses from './album.js';
 import * as artTagClasses from './art-tag.js';
 import * as artistClasses from './artist.js';
+import * as artworkClasses from './artwork.js';
+import * as contentClasses from './content.js';
 import * as contributionClasses from './contribution.js';
 import * as flashClasses from './flash.js';
 import * as groupClasses from './group.js';
@@ -24,9 +28,13 @@ import * as trackClasses from './track.js';
 import * as wikiInfoClasses from './wiki-info.js';
 
 const allClassLists = {
+  'additional-file.js': additionalFileClasses,
+  'additional-name.js': additionalNameClasses,
   'album.js': albumClasses,
   'art-tag.js': artTagClasses,
   'artist.js': artistClasses,
+  'artwork.js': artworkClasses,
+  'content.js': contentClasses,
   'contribution.js': contributionClasses,
   'flash.js': flashClasses,
   'group.js': groupClasses,
diff --git a/src/data/things/language.js b/src/data/things/language.js
index a3f861bd..e3689643 100644
--- a/src/data/things/language.js
+++ b/src/data/things/language.js
@@ -135,6 +135,7 @@ export class Language extends Thing {
     },
 
     intl_date: this.#intlHelper(Intl.DateTimeFormat, {full: true}),
+    intl_dateYear: this.#intlHelper(Intl.DateTimeFormat, {year: 'numeric'}),
     intl_number: this.#intlHelper(Intl.NumberFormat),
     intl_listConjunction: this.#intlHelper(Intl.ListFormat, {type: 'conjunction'}),
     intl_listDisjunction: this.#intlHelper(Intl.ListFormat, {type: 'disjunction'}),
@@ -488,22 +489,44 @@ export class Language extends Thing {
     // or both are undefined, that's just blank content.
     const hasStart = startDate !== null && startDate !== undefined;
     const hasEnd = endDate !== null && endDate !== undefined;
-    if (!hasStart || !hasEnd) {
-      if (startDate === endDate) {
-        return html.blank();
-      } else if (hasStart) {
-        throw new Error(`Expected both start and end of date range, got only start`);
-      } else if (hasEnd) {
-        throw new Error(`Expected both start and end of date range, got only end`);
-      } else {
-        throw new Error(`Got mismatched ${startDate}/${endDate} for start and end`);
-      }
+    if (!hasStart && !hasEnd) {
+      return html.blank();
+    } else if (hasStart && !hasEnd) {
+      throw new Error(`Expected both start and end of date range, got only start`);
+    } else if (!hasStart && hasEnd) {
+      throw new Error(`Expected both start and end of date range, got only end`);
     }
 
     this.assertIntlAvailable('intl_date');
     return this.intl_date.formatRange(startDate, endDate);
   }
 
+  formatYear(date) {
+    if (date === null || date === undefined) {
+      return html.blank();
+    }
+
+    this.assertIntlAvailable('intl_dateYear');
+    return this.intl_dateYear.format(date);
+  }
+
+  formatYearRange(startDate, endDate) {
+    // formatYearRange expects both values to be present, but if both are null
+    // or both are undefined, that's just blank content.
+    const hasStart = startDate !== null && startDate !== undefined;
+    const hasEnd = endDate !== null && endDate !== undefined;
+    if (!hasStart && !hasEnd) {
+      return html.blank();
+    } else if (hasStart && !hasEnd) {
+      throw new Error(`Expected both start and end of date range, got only start`);
+    } else if (!hasStart && hasEnd) {
+      throw new Error(`Expected both start and end of date range, got only end`);
+    }
+
+    this.assertIntlAvailable('intl_dateYear');
+    return this.intl_dateYear.formatRange(startDate, endDate);
+  }
+
   formatDateDuration({
     years: numYears = 0,
     months: numMonths = 0,
@@ -842,6 +865,18 @@ export class Language extends Thing {
     }
   }
 
+  typicallyLowerCase(string) {
+    // Utter nonsense implementation, so this only works on strings,
+    // not actual HTML content, and may rudely disrespect *intentful*
+    // capitalization of whatever goes into it.
+
+    if (typeof string !== 'string') return string;
+    if (string.length <= 1) return string;
+    if (/^\S+?[A-Z]/.test(string)) return string;
+
+    return string[0].toLowerCase() + string.slice(1);
+  }
+
   // Utility function to quickly provide a useful string key
   // (generally a prefix) to stuff nested beneath it.
   encapsulate(...args) {
diff --git a/src/data/things/sorting-rule.js b/src/data/things/sorting-rule.js
index b169a541..ccc4ad89 100644
--- a/src/data/things/sorting-rule.js
+++ b/src/data/things/sorting-rule.js
@@ -3,7 +3,6 @@ export const SORTING_RULE_DATA_FILE = 'sorting-rules.yaml';
 import {readFile, writeFile} from 'node:fs/promises';
 import * as path from 'node:path';
 
-import {input} from '#composite';
 import {chunkByProperties, compareArrays, unique} from '#sugar';
 import Thing from '#thing';
 import {isObject, isStringNonEmpty, anyOf, strictArrayOf} from '#validators';
diff --git a/src/data/things/track.js b/src/data/things/track.js
index 69953d33..8b9420c7 100644
--- a/src/data/things/track.js
+++ b/src/data/things/track.js
@@ -11,10 +11,15 @@ import {
   parseAdditionalFiles,
   parseAdditionalNames,
   parseAnnotatedReferences,
+  parseArtwork,
+  parseCommentary,
   parseContributors,
+  parseCreditingSources,
+  parseReferencingSources,
   parseDate,
   parseDimensions,
   parseDuration,
+  parseLyrics,
 } from '#yaml';
 
 import {withPropertyFromObject} from '#composite/data';
@@ -34,11 +39,8 @@ import {
 } from '#composite/wiki-data';
 
 import {
-  additionalFiles,
-  additionalNameList,
-  commentary,
   commentatorArtists,
-  contentString,
+  constitutibleArtworkList,
   contributionList,
   dimensions,
   directory,
@@ -54,6 +56,7 @@ import {
   soupyFind,
   soupyReverse,
   thing,
+  thingList,
   urls,
   wikiData,
 } from '#composite/wiki-properties';
@@ -62,10 +65,10 @@ import {
   exitWithoutUniqueCoverArt,
   inheritContributionListFromMainRelease,
   inheritFromMainRelease,
-  withAlbum,
   withAllReleases,
   withAlwaysReferenceByDirectory,
   withContainingTrackSection,
+  withCoverArtistContribs,
   withDate,
   withDirectorySuffix,
   withHasUniqueCoverArt,
@@ -81,10 +84,15 @@ export class Track extends Thing {
   static [Thing.referenceType] = 'track';
 
   static [Thing.getPropertyDescriptors] = ({
+    AdditionalFile,
+    AdditionalName,
     Album,
     ArtTag,
-    Flash,
-    TrackSection,
+    Artwork,
+    CommentaryEntry,
+    CreditingSourcesEntry,
+    LyricsEntry,
+    ReferencingSourcesEntry,
     WikiInfo,
   }) => ({
     // Update & expose
@@ -121,7 +129,13 @@ export class Track extends Thing {
       })
     ],
 
-    additionalNames: additionalNameList(),
+    album: thing({
+      class: input.value(Album),
+    }),
+
+    additionalNames: thingList({
+      class: input.value(AdditionalName),
+    }),
 
     bandcampTrackIdentifier: simpleString(),
     bandcampArtworkIdentifier: simpleString(),
@@ -156,6 +170,18 @@ export class Track extends Thing {
       exposeDependency({dependency: '#alwaysReferenceByDirectory'}),
     ],
 
+    countInArtistTotals: [
+      exposeUpdateValueOrContinue({
+        validate: input.value(isBoolean),
+      }),
+
+      withPropertyFromAlbum({
+        property: input.value('countTracksInArtistTotals'),
+      }),
+
+      exposeDependency({dependency: '#album.countTracksInArtistTotals'}),
+    ],
+
     // Disables presenting the track as though it has its own unique artwork.
     // This flag should only be used in select circumstances, i.e. to override
     // an album's trackCoverArtists. This flag supercedes that property, as well
@@ -197,6 +223,8 @@ export class Track extends Thing {
     coverArtDimensions: [
       exitWithoutUniqueCoverArt(),
 
+      exposeUpdateValueOrContinue(),
+
       withPropertyFromAlbum({
         property: input.value('trackDimensions'),
       }),
@@ -206,31 +234,46 @@ export class Track extends Thing {
       dimensions(),
     ],
 
-    commentary: commentary(),
-    creditSources: commentary(),
+    commentary: thingList({
+      class: input.value(CommentaryEntry),
+    }),
+
+    creditingSources: thingList({
+      class: input.value(CreditingSourcesEntry),
+    }),
+
+    referencingSources: thingList({
+      class: input.value(ReferencingSourcesEntry),
+    }),
 
     lyrics: [
+      // TODO: Inherited lyrics are literally the same objects, so of course
+      // their .thing properties aren't going to point back to this one, and
+      // certainly couldn't be recontextualized...
       inheritFromMainRelease(),
-      contentString(),
+
+      thingList({
+        class: input.value(LyricsEntry),
+      }),
     ],
 
-    additionalFiles: additionalFiles(),
-    sheetMusicFiles: additionalFiles(),
-    midiProjectFiles: additionalFiles(),
+    additionalFiles: thingList({
+      class: input.value(AdditionalFile),
+    }),
+
+    sheetMusicFiles: thingList({
+      class: input.value(AdditionalFile),
+    }),
+
+    midiProjectFiles: thingList({
+      class: input.value(AdditionalFile),
+    }),
 
     mainReleaseTrack: singleReference({
       class: input.value(Track),
       find: soupyFind.input('track'),
     }),
 
-    // Internal use only - for directly identifying an album inside a track's
-    // util.inspect display, if it isn't indirectly available (by way of being
-    // included in an album's track list).
-    dataSourceAlbum: singleReference({
-      class: input.value(Album),
-      find: soupyFind.input('album'),
-    }),
-
     artistContribs: [
       inheritContributionListFromMainRelease(),
 
@@ -279,43 +322,13 @@ export class Track extends Thing {
     ],
 
     coverArtistContribs: [
-      exitWithoutUniqueCoverArt({
-        value: input.value([]),
-      }),
-
-      withTrackArtDate({
-        fallback: input.value(true),
-      }),
-
-      withResolvedContribs({
-        from: input.updateValue({validate: isContributionList}),
-        thingProperty: input.thisProperty(),
-        artistProperty: input.value('trackCoverArtistContributions'),
-        date: '#trackArtDate',
-      }).outputs({
-        '#resolvedContribs': '#coverArtistContribs',
-      }),
-
-      exposeDependencyOrContinue({
-        dependency: '#coverArtistContribs',
-        mode: input.value('empty'),
-      }),
-
-      withPropertyFromAlbum({
-        property: input.value('trackCoverArtistContribs'),
-      }),
-
-      withRecontextualizedContributionList({
-        list: '#album.trackCoverArtistContribs',
-        artistProperty: input.value('trackCoverArtistContributions'),
-      }),
-
-      withRedatedContributionList({
-        list: '#album.trackCoverArtistContribs',
-        date: '#trackArtDate',
+      withCoverArtistContribs({
+        from: input.updateValue({
+          validate: isContributionList,
+        }),
       }),
 
-      exposeDependency({dependency: '#album.trackCoverArtistContribs'}),
+      exposeDependency({dependency: '#coverArtistContribs'}),
     ],
 
     referencedTracks: [
@@ -340,6 +353,15 @@ export class Track extends Thing {
       }),
     ],
 
+    trackArtworks: [
+      exitWithoutUniqueCoverArt({
+        value: input.value([]),
+      }),
+
+      constitutibleArtworkList.fromYAMLFieldSpec
+        .call(this, 'Track Artwork'),
+    ],
+
     artTags: [
       exitWithoutUniqueCoverArt({
         value: input.value([]),
@@ -356,13 +378,7 @@ export class Track extends Thing {
         value: input.value([]),
       }),
 
-      withTrackArtDate({
-        fallback: input.value(true),
-      }),
-
-      referencedArtworkList({
-        date: '#trackArtDate',
-      }),
+      referencedArtworkList(),
     ],
 
     // Update only
@@ -371,11 +387,11 @@ export class Track extends Thing {
     reverse: soupyReverse(),
 
     // used for referencedArtworkList (mixedFind)
-    albumData: wikiData({
-      class: input.value(Album),
+    artworkData: wikiData({
+      class: input.value(Artwork),
     }),
 
-    // used for referencedArtworkList (mixedFind)
+    // used for withAlwaysReferenceByDirectory (for some reason)
     trackData: wikiData({
       class: input.value(Track),
     }),
@@ -389,11 +405,6 @@ export class Track extends Thing {
 
     commentatorArtists: commentatorArtists(),
 
-    album: [
-      withAlbum(),
-      exposeDependency({dependency: '#album'}),
-    ],
-
     date: [
       withDate(),
       exposeDependency({dependency: '#date'}),
@@ -442,6 +453,16 @@ export class Track extends Thing {
       exposeDependency({dependency: '#otherReleases'}),
     ],
 
+    groups: [
+      withPropertyFromAlbum({
+        property: input.value('groups'),
+      }),
+
+      exposeDependency({
+        dependency: '#album.groups',
+      }),
+    ],
+
     referencedByTracks: reverseReferenceList({
       reverse: soupyReverse.input('tracksWhichReference'),
     }),
@@ -453,16 +474,6 @@ export class Track extends Thing {
     featuredInFlashes: reverseReferenceList({
       reverse: soupyReverse.input('flashesWhichFeature'),
     }),
-
-    referencedByArtworks: [
-      exitWithoutUniqueCoverArt({
-        value: input.value([]),
-      }),
-
-      reverseReferenceList({
-        reverse: soupyReverse.input('artworksWhichReference'),
-      }),
-    ],
   });
 
   static [Thing.yamlDocumentSpec] = {
@@ -486,6 +497,8 @@ export class Track extends Thing {
         transform: String,
       },
 
+      'Count In Artist Totals': {property: 'countInArtistTotals'},
+
       'Duration': {
         property: 'duration',
         transform: parseDuration,
@@ -521,9 +534,25 @@ export class Track extends Thing {
 
       'Always Reference By Directory': {property: 'alwaysReferenceByDirectory'},
 
-      'Lyrics': {property: 'lyrics'},
-      'Commentary': {property: 'commentary'},
-      'Credit Sources': {property: 'creditSources'},
+      'Lyrics': {
+        property: 'lyrics',
+        transform: parseLyrics,
+      },
+
+      'Commentary': {
+        property: 'commentary',
+        transform: parseCommentary,
+      },
+
+      'Crediting Sources': {
+        property: 'creditingSources',
+        transform: parseCreditingSources,
+      },
+
+      'Referencing Sources': {
+        property: 'referencingSources',
+        transform: parseReferencingSources,
+      },
 
       'Additional Files': {
         property: 'additionalFiles',
@@ -567,12 +596,32 @@ export class Track extends Thing {
         transform: parseContributors,
       },
 
+      'Track Artwork': {
+        property: 'trackArtworks',
+        transform:
+          parseArtwork({
+            thingProperty: 'trackArtworks',
+            dimensionsFromThingProperty: 'coverArtDimensions',
+            fileExtensionFromThingProperty: 'coverArtFileExtension',
+            dateFromThingProperty: 'coverArtDate',
+            artTagsFromThingProperty: 'artTags',
+            referencedArtworksFromThingProperty: 'referencedArtworks',
+            artistContribsFromThingProperty: 'coverArtistContribs',
+            artistContribsArtistProperty: 'trackCoverArtistContributions',
+          }),
+      },
+
       'Art Tags': {property: 'artTags'},
 
       'Review Points': {ignore: true},
     },
 
     invalidFieldCombinations: [
+      {message: `Secondary releases never count in artist totals`, fields: [
+        'Main Release',
+        'Count In Artist Totals',
+      ]},
+
       {message: `Secondary releases inherit references from the main one`, fields: [
         'Main Release',
         'Referenced Tracks',
@@ -658,6 +707,31 @@ export class Track extends Thing {
           ? []
           : [track.name]),
     },
+
+    trackPrimaryArtwork: {
+      [Thing.findThisThingOnly]: false,
+
+      referenceTypes: [
+        'track',
+        'track-referencing-artworks',
+        'track-referenced-artworks',
+      ],
+
+      bindTo: 'artworkData',
+
+      include: (artwork, {Artwork, Track}) =>
+        artwork instanceof Artwork &&
+        artwork.thing instanceof Track &&
+        artwork === artwork.thing.trackArtworks[0],
+
+      getMatchableNames: ({thing: track}) =>
+        (track.alwaysReferenceByDirectory
+          ? []
+          : [track.name]),
+
+      getMatchableDirectories: ({thing: track}) =>
+        [track.directory],
+    },
   };
 
   static [Thing.reverseSpecs] = {
@@ -689,7 +763,7 @@ export class Track extends Thing {
       soupyReverse.contributionsBy('trackData', 'contributorContribs'),
 
     trackCoverArtistContributionsBy:
-      soupyReverse.contributionsBy('trackData', 'coverArtistContribs'),
+      soupyReverse.artworkContributionsBy('trackData', 'trackArtworks'),
 
     tracksWithCommentaryBy: {
       bindTo: 'trackData',
@@ -709,6 +783,55 @@ export class Track extends Thing {
   // Track YAML loading is handled in album.js.
   static [Thing.getYamlLoadingSpec] = null;
 
+  getOwnAdditionalFilePath(_file, filename) {
+    if (!this.album) return null;
+
+    return [
+      'media.albumAdditionalFile',
+      this.album.directory,
+      filename,
+    ];
+  }
+
+  getOwnArtworkPath(artwork) {
+    if (!this.album) return null;
+
+    return [
+      'media.trackCover',
+      this.album.directory,
+
+      (artwork.unqualifiedDirectory
+        ? this.directory + '-' + artwork.unqualifiedDirectory
+        : this.directory),
+
+      artwork.fileExtension,
+    ];
+  }
+
+  countOwnContributionInContributionTotals(_contrib) {
+    if (!this.countInArtistTotals) {
+      return false;
+    }
+
+    if (this.isSecondaryRelease) {
+      return false;
+    }
+
+    return true;
+  }
+
+  countOwnContributionInDurationTotals(_contrib) {
+    if (!this.countInArtistTotals) {
+      return false;
+    }
+
+    if (this.isSecondaryRelease) {
+      return false;
+    }
+
+    return true;
+  }
+
   [inspect.custom](depth) {
     const parts = [];
 
@@ -721,15 +844,7 @@ export class Track extends Thing {
     let album;
 
     if (depth >= 0) {
-      try {
-        album = this.album;
-      } catch (_error) {
-        // Computing album might crash for any reason, which we don't want to
-        // distract from another error we might be trying to work out at the
-        // moment (for which debugging might involve inspecting this track!).
-      }
-
-      album ??= this.dataSourceAlbum;
+      album = this.album;
     }
 
     if (album) {
diff --git a/src/data/things/wiki-info.js b/src/data/things/wiki-info.js
index 590598be..f97f9027 100644
--- a/src/data/things/wiki-info.js
+++ b/src/data/things/wiki-info.js
@@ -2,7 +2,7 @@ export const WIKI_INFO_FILE = 'wiki-info.yaml';
 
 import {input} from '#composite';
 import Thing from '#thing';
-import {parseContributionPresets} from '#yaml';
+import {parseContributionPresets, parseWallpaperParts} from '#yaml';
 
 import {
   isBoolean,
@@ -14,8 +14,17 @@ import {
 } from '#validators';
 
 import {exitWithoutDependency} from '#composite/control-flow';
-import {contentString, flag, name, referenceList, soupyFind}
-  from '#composite/wiki-properties';
+
+import {
+  contentString,
+  fileExtension,
+  flag,
+  name,
+  referenceList,
+  simpleString,
+  soupyFind,
+  wallpaperParts,
+} from '#composite/wiki-properties';
 
 export class WikiInfo extends Thing {
   static [Thing.friendlyName] = `Wiki Info`;
@@ -68,6 +77,10 @@ export class WikiInfo extends Thing {
       },
     },
 
+    wikiWallpaperFileExtension: fileExtension('jpg'),
+    wikiWallpaperStyle: simpleString(),
+    wikiWallpaperParts: wallpaperParts(),
+
     divideTrackListsByGroups: referenceList({
       class: input.value(Group),
       find: soupyFind.input('group'),
@@ -112,18 +125,34 @@ export class WikiInfo extends Thing {
     fields: {
       'Name': {property: 'name'},
       'Short Name': {property: 'nameShort'},
+
       'Color': {property: 'color'},
+
       'Description': {property: 'description'},
+
       'Footer Content': {property: 'footerContent'},
+
       'Default Language': {property: 'defaultLanguage'},
+
       'Canonical Base': {property: 'canonicalBase'},
-      'Divide Track Lists By Groups': {property: 'divideTrackListsByGroups'},
+
+      'Wiki Wallpaper File Extension': {property: 'wikiWallpaperFileExtension'},
+
+      'Wiki Wallpaper Style': {property: 'wikiWallpaperStyle'},
+
+      'Wiki Wallpaper Parts': {
+        property: 'wikiWallpaperParts',
+        transform: parseWallpaperParts,
+      },
+
       'Enable Flashes & Games': {property: 'enableFlashesAndGames'},
       'Enable Listings': {property: 'enableListings'},
       'Enable News': {property: 'enableNews'},
       'Enable Art Tag UI': {property: 'enableArtTagUI'},
       'Enable Group UI': {property: 'enableGroupUI'},
 
+      'Divide Track Lists By Groups': {property: 'divideTrackListsByGroups'},
+
       'Contribution Presets': {
         property: 'contributionPresets',
         transform: parseContributionPresets,
diff --git a/src/data/yaml.js b/src/data/yaml.js
index a5614ea6..9a0295b8 100644
--- a/src/data/yaml.js
+++ b/src/data/yaml.js
@@ -8,11 +8,14 @@ import {inspect as nodeInspect} from 'node:util';
 import yaml from 'js-yaml';
 
 import {colors, ENABLE_COLOR, logInfo, logWarn} from '#cli';
+import {parseContentNodes, splitContentNodesAround} from '#replacer';
 import {sortByName} from '#sort';
 import Thing from '#thing';
 import thingConstructors from '#things';
+import {matchContentEntries, multipleLyricsDetectionRegex} from '#wiki-data';
 
 import {
+  aggregateThrows,
   annotateErrorWithFile,
   decorateErrorWithIndex,
   decorateErrorWithAnnotation,
@@ -88,6 +91,10 @@ function makeProcessDocument(thingConstructor, {
   // A or B.
   //
   invalidFieldCombinations = [],
+
+  // Bouncing function used to process subdocuments: this is a function which
+  // in turn calls the appropriate *result of* makeProcessDocument.
+  processDocument: bouncer,
 }) {
   if (!thingConstructor) {
     throw new Error(`Missing Thing class`);
@@ -97,6 +104,10 @@ function makeProcessDocument(thingConstructor, {
     throw new Error(`Expected fields to be provided`);
   }
 
+  if (!bouncer) {
+    throw new Error(`Missing processDocument bouncer`);
+  }
+
   const knownFields = Object.keys(fieldSpecs);
 
   const ignoredFields =
@@ -144,9 +155,12 @@ function makeProcessDocument(thingConstructor, {
         : `document`);
 
     const aggregate = openAggregate({
+      ...aggregateThrows(ProcessDocumentError),
       message: `Errors processing ${constructorPart}` + namePart,
     });
 
+    const thing = Reflect.construct(thingConstructor, []);
+
     const documentEntries = Object.entries(document)
       .filter(([field]) => !ignoredFields.includes(field));
 
@@ -194,13 +208,50 @@ function makeProcessDocument(thingConstructor, {
 
     const fieldValues = {};
 
+    const subdocSymbol = Symbol('subdoc');
+    const subdocLayouts = {};
+
+    const isSubdocToken = value =>
+      typeof value === 'object' &&
+      value !== null &&
+      Object.hasOwn(value, subdocSymbol);
+
+    const transformUtilities = {
+      ...thingConstructors,
+
+      subdoc(documentType, data, {
+        bindInto = null,
+        provide = null,
+      } = {}) {
+        if (!documentType)
+          throw new Error(`Expected document type, got ${typeAppearance(documentType)}`);
+        if (!data)
+          throw new Error(`Expected data, got ${typeAppearance(data)}`);
+        if (typeof data !== 'object' || data === null)
+          throw new Error(`Expected data to be an object, got ${typeAppearance(data)}`);
+        if (typeof bindInto !== 'string' && bindInto !== null)
+          throw new Error(`Expected bindInto to be a string, got ${typeAppearance(bindInto)}`);
+        if (typeof provide !== 'object' && provide !== null)
+          throw new Error(`Expected provide to be an object, got ${typeAppearance(provide)}`);
+
+        return {
+          [subdocSymbol]: {
+            documentType,
+            data,
+            bindInto,
+            provide,
+          },
+        };
+      },
+    };
+
     for (const [field, documentValue] of documentEntries) {
       if (skippedFields.has(field)) continue;
 
       // This variable would like to certify itself as "not into capitalism".
       let propertyValue =
         (fieldSpecs[field].transform
-          ? fieldSpecs[field].transform(documentValue)
+          ? fieldSpecs[field].transform(documentValue, transformUtilities)
           : documentValue);
 
       // Completely blank items in a YAML list are read as null.
@@ -223,10 +274,99 @@ function makeProcessDocument(thingConstructor, {
         }
       }
 
+      if (isSubdocToken(propertyValue)) {
+        subdocLayouts[field] = propertyValue[subdocSymbol];
+        continue;
+      }
+
+      if (Array.isArray(propertyValue) && propertyValue.every(isSubdocToken)) {
+        subdocLayouts[field] =
+          propertyValue
+            .map(token => token[subdocSymbol]);
+        continue;
+      }
+
       fieldValues[field] = propertyValue;
     }
 
-    const thing = Reflect.construct(thingConstructor, []);
+    const subdocErrors = [];
+
+    const followSubdocSetup = setup => {
+      let error = null;
+
+      let subthing;
+      try {
+        const result = bouncer(setup.data, setup.documentType);
+        subthing = result.thing;
+        result.aggregate.close();
+      } catch (caughtError) {
+        error = caughtError;
+      }
+
+      if (subthing) {
+        if (setup.bindInto) {
+          subthing[setup.bindInto] = thing;
+        }
+
+        if (setup.provide) {
+          Object.assign(subthing, setup.provide);
+        }
+      }
+
+      return {error, subthing};
+    };
+
+    for (const [field, layout] of Object.entries(subdocLayouts)) {
+      if (Array.isArray(layout)) {
+        const subthings = [];
+        let anySucceeded = false;
+        let anyFailed = false;
+
+        for (const [index, setup] of layout.entries()) {
+          const {subthing, error} = followSubdocSetup(setup);
+          if (error) {
+            subdocErrors.push(new SubdocError(
+              {field, index},
+              setup,
+              {cause: error}));
+          }
+
+          if (subthing) {
+            subthings.push(subthing);
+            anySucceeded = true;
+          } else {
+            anyFailed = true;
+          }
+        }
+
+        if (anySucceeded) {
+          fieldValues[field] = subthings;
+        } else if (anyFailed) {
+          skippedFields.add(field);
+        }
+      } else {
+        const setup = layout;
+        const {subthing, error} = followSubdocSetup(setup);
+
+        if (error) {
+          subdocErrors.push(new SubdocError(
+            {field},
+            setup,
+            {cause: error}));
+        }
+
+        if (subthing) {
+          fieldValues[field] = subthing;
+        } else {
+          skippedFields.add(field);
+        }
+      }
+    }
+
+    if (!empty(subdocErrors)) {
+      aggregate.push(new SubdocAggregateError(
+        subdocErrors, thingConstructor));
+    }
 
     const fieldValueErrors = [];
 
@@ -260,6 +400,8 @@ function makeProcessDocument(thingConstructor, {
   });
 }
 
+export class ProcessDocumentError extends AggregateError {}
+
 export class UnknownFieldsError extends Error {
   constructor(fields) {
     super(`Unknown fields ignored: ${fields.map(field => colors.red(field)).join(', ')}`);
@@ -347,12 +489,46 @@ export class SkippedFieldsSummaryError extends Error {
         : `${entries.length} fields`);
 
     super(
-      colors.bright(colors.yellow(`Altogether, skipped ${numFieldsText}:\n`)) +
+      colors.bright(colors.yellow(`Altogether, skipped ${numFieldsText}:`)) + '\n' +
       lines.join('\n') + '\n' +
       colors.bright(colors.yellow(`See above errors for details.`)));
   }
 }
 
+export class SubdocError extends Error {
+  constructor({field, index = null}, setup, options) {
+    const fieldText =
+      (index === null
+        ? colors.green(`"${field}"`)
+        : colors.yellow(`#${index + 1}`) + ' in ' +
+          colors.green(`"${field}"`));
+
+    const constructorText =
+      setup.documentType.name;
+
+    if (options.cause instanceof ProcessDocumentError) {
+      options.cause[Symbol.for('hsmusic.aggregate.translucent')] = true;
+    }
+
+    super(
+      `Errors processing ${constructorText} for ${fieldText} field`,
+      options);
+  }
+}
+
+export class SubdocAggregateError extends AggregateError {
+  [Symbol.for('hsmusic.aggregate.translucent')] = true;
+
+  constructor(errors, thingConstructor) {
+    const constructorText =
+      colors.green(thingConstructor.name);
+
+    super(
+      errors,
+      `Errors processing subdocuments for ${constructorText}`);
+  }
+}
+
 export function parseDate(date) {
   return new Date(date);
 }
@@ -435,49 +611,39 @@ export function parseContributors(entries) {
   });
 }
 
-export function parseAdditionalFiles(entries) {
+export function parseAdditionalFiles(entries, {subdoc, AdditionalFile}) {
   return parseArrayEntries(entries, item => {
     if (typeof item !== 'object') return item;
 
-    return {
-      title: item['Title'],
-      description: item['Description'] ?? null,
-      files: item['Files'],
-    };
+    return subdoc(AdditionalFile, item, {bindInto: 'thing'});
   });
 }
 
-export function parseAdditionalNames(entries) {
+export function parseAdditionalNames(entries, {subdoc, AdditionalName}) {
   return parseArrayEntries(entries, item => {
-    if (typeof item === 'object' && typeof item['Name'] === 'string')
-      return {
-        name: item['Name'],
-        annotation: item['Annotation'] ?? null,
-      };
+    if (typeof item === 'object') {
+      return subdoc(AdditionalName, item, {bindInto: 'thing'});
+    }
 
     if (typeof item !== 'string') return item;
 
     const match = item.match(extractAccentRegex);
     if (!match) return item;
 
-    return {
-      name: match.groups.main,
-      annotation: match.groups.accent ?? null,
+    const document = {
+      ['Name']: match.groups.main,
+      ['Annotation']: match.groups.accent ?? null,
     };
+
+    return subdoc(AdditionalName, document, {bindInto: 'thing'});
   });
 }
 
-export function parseSerieses(entries) {
+export function parseSerieses(entries, {subdoc, Series}) {
   return parseArrayEntries(entries, item => {
     if (typeof item !== 'object') return item;
 
-    return {
-      name: item['Name'],
-      description: item['Description'] ?? null,
-      albums: item['Albums'] ?? null,
-
-      showAlbumArtists: item['Show Album Artists'] ?? null,
-    };
+    return subdoc(Series, item, {bindInto: 'group'});
   });
 }
 
@@ -615,6 +781,172 @@ export function parseAnnotatedReferences(entries, {
   });
 }
 
+export function parseArtwork({
+  single = false,
+  thingProperty = null,
+  dimensionsFromThingProperty = null,
+  fileExtensionFromThingProperty = null,
+  dateFromThingProperty = null,
+  artistContribsFromThingProperty = null,
+  artistContribsArtistProperty = null,
+  artTagsFromThingProperty = null,
+  referencedArtworksFromThingProperty = null,
+}) {
+  const provide = {
+    thingProperty,
+    dimensionsFromThingProperty,
+    fileExtensionFromThingProperty,
+    dateFromThingProperty,
+    artistContribsFromThingProperty,
+    artistContribsArtistProperty,
+    artTagsFromThingProperty,
+    referencedArtworksFromThingProperty,
+  };
+
+  const parseSingleEntry = (entry, {subdoc, Artwork}) =>
+    subdoc(Artwork, entry, {bindInto: 'thing', provide});
+
+  const transform = (value, ...args) =>
+    (Array.isArray(value)
+      ? value.map(entry => parseSingleEntry(entry, ...args))
+   : single
+      ? parseSingleEntry(value, ...args)
+      : [parseSingleEntry(value, ...args)]);
+
+  transform.provide = provide;
+
+  return transform;
+}
+
+export function parseContentEntriesFromSourceText(thingClass, sourceText, {subdoc}) {
+  function map(matchEntry) {
+    let artistText = null, artistReferences = null;
+
+    const artistTextNodes =
+      Array.from(
+        splitContentNodesAround(
+          parseContentNodes(matchEntry.artistText),
+          /\|/g));
+
+    const separatorIndices =
+      artistTextNodes
+        .filter(node => node.type === 'separator')
+        .map(node => artistTextNodes.indexOf(node));
+
+    if (empty(separatorIndices)) {
+      if (artistTextNodes.length === 1 && artistTextNodes[0].type === 'text') {
+        artistReferences = matchEntry.artistText;
+      } else {
+        artistText = matchEntry.artistText;
+      }
+    } else {
+      const firstSeparatorIndex =
+        separatorIndices.at(0);
+
+      const secondSeparatorIndex =
+        separatorIndices.at(1) ??
+        artistTextNodes.length;
+
+      artistReferences =
+        matchEntry.artistText.slice(
+          artistTextNodes.at(0).i,
+          artistTextNodes.at(firstSeparatorIndex - 1).iEnd);
+
+      artistText =
+        matchEntry.artistText.slice(
+          artistTextNodes.at(firstSeparatorIndex).iEnd,
+          artistTextNodes.at(secondSeparatorIndex - 1).iEnd);
+    }
+
+    if (artistReferences) {
+      artistReferences =
+        artistReferences
+          .split(',')
+          .map(ref => ref.trim());
+    }
+
+    return {
+      'Artists':
+        artistReferences,
+
+      'Artist Text':
+        artistText,
+
+      'Annotation':
+        matchEntry.annotation,
+
+      'Date':
+        matchEntry.date,
+
+      'Second Date':
+        matchEntry.secondDate,
+
+      'Date Kind':
+        matchEntry.dateKind,
+
+      'Access Date':
+        matchEntry.accessDate,
+
+      'Access Kind':
+        matchEntry.accessKind,
+
+      'Body':
+        matchEntry.body,
+    };
+  }
+
+  const documents =
+    matchContentEntries(sourceText)
+      .map(matchEntry =>
+        withEntries(
+          map(matchEntry),
+          entries => entries
+            .filter(([key, value]) =>
+              value !== undefined &&
+              value !== null)));
+
+  const subdocs =
+    documents.map(document =>
+      subdoc(thingClass, document, {bindInto: 'thing'}));
+
+  return subdocs;
+}
+
+export function parseContentEntries(thingClass, value, {subdoc}) {
+  if (typeof value === 'string') {
+    return parseContentEntriesFromSourceText(thingClass, value, {subdoc});
+  } else if (Array.isArray(value)) {
+    return value.map(doc => subdoc(thingClass, doc, {bindInto: 'thing'}));
+  } else {
+    return value;
+  }
+}
+
+export function parseCommentary(value, {subdoc, CommentaryEntry}) {
+  return parseContentEntries(CommentaryEntry, value, {subdoc});
+}
+
+export function parseCreditingSources(value, {subdoc, CreditingSourcesEntry}) {
+  return parseContentEntries(CreditingSourcesEntry, value, {subdoc});
+}
+
+export function parseReferencingSources(value, {subdoc, ReferencingSourcesEntry}) {
+  return parseContentEntries(ReferencingSourcesEntry, value, {subdoc});
+}
+
+export function parseLyrics(value, {subdoc, LyricsEntry}) {
+  if (
+    typeof value === 'string' &&
+    !multipleLyricsDetectionRegex.test(value)
+  ) {
+    const document = {'Body': value};
+
+    return [subdoc(LyricsEntry, document, {bindInto: 'thing'})];
+  }
+
+  return parseContentEntries(LyricsEntry, value, {subdoc});
+}
+
 // documentModes: Symbols indicating sets of behavior for loading and processing
 // data files.
 export const documentModes = {
@@ -690,7 +1022,7 @@ export const documentModes = {
 export function getAllDataSteps() {
   try {
     thingConstructors;
-  } catch (error) {
+  } catch {
     throw new Error(`Thing constructors aren't ready yet, can't get all data steps`);
   }
 
@@ -899,7 +1231,7 @@ export function processThingsFromDataStep(documents, dataStep) {
         throw new Error(`Class "${thingClass.name}" doesn't specify Thing.yamlDocumentSpec`);
       }
 
-      fn = makeProcessDocument(thingClass, spec);
+      fn = makeProcessDocument(thingClass, {...spec, processDocument});
       submap.set(thingClass, fn);
     }
 
@@ -1280,8 +1612,7 @@ export function linkWikiDataArrays(wikiData, {bindFind, bindReverse}) {
     // link if the 'find' or 'reverse' properties will be implicitly linked
 
     ['albumData', [
-      'albumData',
-      'trackData',
+      'artworkData',
       'wikiInfo',
     ]],
 
@@ -1289,6 +1620,12 @@ export function linkWikiDataArrays(wikiData, {bindFind, bindReverse}) {
 
     ['artistData', [/* find, reverse */]],
 
+    ['artworkData', ['artworkData']],
+
+    ['commentaryData', [/* find */]],
+
+    ['creditingSourceData', [/* find */]],
+
     ['flashData', [
       'wikiInfo',
     ]],
@@ -1303,8 +1640,14 @@ export function linkWikiDataArrays(wikiData, {bindFind, bindReverse}) {
 
     ['homepageLayout.sections.rows', [/* find */]],
 
+    ['lyricsData', [/* find */]],
+
+    ['referencingSourceData', [/* find */]],
+
+    ['seriesData', [/* find */]],
+
     ['trackData', [
-      'albumData',
+      'artworkData',
       'trackData',
       'wikiInfo',
     ]],
@@ -1571,14 +1914,16 @@ export function flattenThingLayoutToDocumentOrder(layout) {
 }
 
 export function* splitDocumentsInYAMLSourceText(sourceText) {
-  const dividerRegex = /^-{3,}\n?/gm;
+  // Not multiline!
+  const dividerRegex = /(?:\r\n|\n|^)-{3,}(?:\r\n|\n|$)/g;
+
   let previousDivider = '';
 
   while (true) {
     const {lastIndex} = dividerRegex;
     const match = dividerRegex.exec(sourceText);
     if (match) {
-      const nextDivider = match[0].trim();
+      const nextDivider = match[0];
 
       yield {
         previousDivider,
@@ -1589,11 +1934,12 @@ export function* splitDocumentsInYAMLSourceText(sourceText) {
       previousDivider = nextDivider;
     } else {
       const nextDivider = '';
+      const lineBreak = previousDivider.match(/\r?\n/)?.[0] ?? '';
 
       yield {
         previousDivider,
         nextDivider,
-        text: sourceText.slice(lastIndex).replace(/(?<!\n)$/, '\n'),
+        text: sourceText.slice(lastIndex).replace(/(?<!\n)$/, lineBreak),
       };
 
       return;
@@ -1619,7 +1965,7 @@ export function recombineDocumentsIntoYAMLSourceText(documents) {
 
   for (const document of documents) {
     if (sourceText) {
-      sourceText += divider + '\n';
+      sourceText += divider;
     }
 
     sourceText += document.text;