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-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/art-tag/index.js2
-rw-r--r--src/data/composite/things/art-tag/withAllDescendantArtTags.js44
-rw-r--r--src/data/composite/things/art-tag/withAncestorArtTagBaobabTree.js46
-rw-r--r--src/data/composite/things/artist/artistTotalDuration.js8
-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/contribution/withContainingReverseContributionList.js46
-rw-r--r--src/data/composite/things/track-section/index.js2
-rw-r--r--src/data/composite/things/track-section/withContinueCountingFrom.js25
-rw-r--r--src/data/composite/things/track-section/withStartCountingFrom.js64
-rw-r--r--src/data/composite/things/track/index.js12
-rw-r--r--src/data/composite/things/track/inheritContributionListFromMainRelease.js (renamed from src/data/composite/things/track/inheritContributionListFromOriginalRelease.js)20
-rw-r--r--src/data/composite/things/track/inheritFromMainRelease.js (renamed from src/data/composite/things/track/inheritFromOriginalRelease.js)18
-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.js46
-rw-r--r--src/data/composite/things/track/withAlwaysReferenceByDirectory.js43
-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/withMainRelease.js (renamed from src/data/composite/things/track/withOriginalRelease.js)28
-rw-r--r--src/data/composite/things/track/withOtherReleases.js30
-rw-r--r--src/data/composite/things/track/withPropertyFromAlbum.js17
-rw-r--r--src/data/composite/things/track/withPropertyFromMainRelease.js (renamed from src/data/composite/things/track/withPropertyFromOriginalRelease.js)36
-rw-r--r--src/data/composite/things/track/withTrackArtDate.js24
-rw-r--r--src/data/composite/things/track/withTrackNumber.js50
-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
71 files changed, 1837 insertions, 850 deletions
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/art-tag/index.js b/src/data/composite/things/art-tag/index.js
new file mode 100644
index 00000000..bbd38293
--- /dev/null
+++ b/src/data/composite/things/art-tag/index.js
@@ -0,0 +1,2 @@
+export {default as withAllDescendantArtTags} from './withAllDescendantArtTags.js';
+export {default as withAncestorArtTagBaobabTree} from './withAncestorArtTagBaobabTree.js';
diff --git a/src/data/composite/things/art-tag/withAllDescendantArtTags.js b/src/data/composite/things/art-tag/withAllDescendantArtTags.js
new file mode 100644
index 00000000..795f96cd
--- /dev/null
+++ b/src/data/composite/things/art-tag/withAllDescendantArtTags.js
@@ -0,0 +1,44 @@
+// Gets all the art tags which descend from this one - that means its own direct
+// descendants, but also all the direct and indirect desceands of each of those!
+// The results aren't specially sorted, but they won't contain any duplicates
+// (for example if two descendant tags both route deeper to end up including
+// some of the same tags).
+
+import {input, templateCompositeFrom} from '#composite';
+import {unique} from '#sugar';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withResolvedReferenceList} from '#composite/wiki-data';
+import {soupyFind} from '#composite/wiki-properties';
+
+export default templateCompositeFrom({
+  annotation: `withAllDescendantArtTags`,
+
+  outputs: ['#allDescendantArtTags'],
+
+  steps: () => [
+    raiseOutputWithoutDependency({
+      dependency: 'directDescendantArtTags',
+      mode: input.value('empty'),
+      output: input.value({'#allDescendantArtTags': []})
+    }),
+
+    withResolvedReferenceList({
+      list: 'directDescendantArtTags',
+      find: soupyFind.input('artTag'),
+    }),
+
+    {
+      dependencies: ['#resolvedReferenceList'],
+      compute: (continuation, {
+        ['#resolvedReferenceList']: directDescendantArtTags,
+      }) => continuation({
+        ['#allDescendantArtTags']:
+          unique([
+            ...directDescendantArtTags,
+            ...directDescendantArtTags.flatMap(artTag => artTag.allDescendantArtTags),
+          ]),
+      }),
+    },
+  ],
+})
diff --git a/src/data/composite/things/art-tag/withAncestorArtTagBaobabTree.js b/src/data/composite/things/art-tag/withAncestorArtTagBaobabTree.js
new file mode 100644
index 00000000..e084a42b
--- /dev/null
+++ b/src/data/composite/things/art-tag/withAncestorArtTagBaobabTree.js
@@ -0,0 +1,46 @@
+// Gets all the art tags which are ancestors of this one as a "baobab tree" -
+// what you'd typically think of as roots are all up in the air! Since this
+// really is backwards from the way that the art tag tree is written in data,
+// chances are pretty good that there will be many of the exact same "leaf"
+// nodes - art tags which don't themselves have any ancestors. In the actual
+// data structure, each node is a Map, with keys for each ancestor and values
+// for each ancestor's own baobab (thus a branching structure, just like normal
+// trees in this regard).
+
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withReverseReferenceList} from '#composite/wiki-data';
+import {soupyReverse} from '#composite/wiki-properties';
+
+export default templateCompositeFrom({
+  annotation: `withAncestorArtTagBaobabTree`,
+
+  outputs: ['#ancestorArtTagBaobabTree'],
+
+  steps: () => [
+    withReverseReferenceList({
+      reverse: soupyReverse.input('artTagsWhichDirectlyAncestor'),
+    }).outputs({
+      ['#reverseReferenceList']: '#directAncestorArtTags',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#directAncestorArtTags',
+      mode: input.value('empty'),
+      output: input.value({'#ancestorArtTagBaobabTree': new Map()}),
+    }),
+
+    {
+      dependencies: ['#directAncestorArtTags'],
+      compute: (continuation, {
+        ['#directAncestorArtTags']: directAncestorArtTags,
+      }) => continuation({
+        ['#ancestorArtTagBaobabTree']:
+          new Map(
+            directAncestorArtTags
+              .map(artTag => [artTag, artTag.ancestorArtTagBaobabTree])),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/artist/artistTotalDuration.js b/src/data/composite/things/artist/artistTotalDuration.js
index a4a33542..b8a205fe 100644
--- a/src/data/composite/things/artist/artistTotalDuration.js
+++ b/src/data/composite/things/artist/artistTotalDuration.js
@@ -48,18 +48,18 @@ export default templateCompositeFrom({
 
     withPropertyFromList({
       list: '#allContributions.thing',
-      property: input.value('isOriginalRelease'),
+      property: input.value('isMainRelease'),
     }),
 
     withFilteredList({
       list: '#allContributions',
-      filter: '#allContributions.thing.isOriginalRelease',
+      filter: '#allContributions.thing.isMainRelease',
     }).outputs({
-      '#filteredList': '#originalContributions',
+      '#filteredList': '#mainReleaseContributions',
     }),
 
     withContributionListSums({
-      list: '#originalContributions',
+      list: '#mainReleaseContributions',
     }),
 
     exposeDependency({
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/contribution/withContainingReverseContributionList.js b/src/data/composite/things/contribution/withContainingReverseContributionList.js
index 56704c8b..175d6cbb 100644
--- a/src/data/composite/things/contribution/withContainingReverseContributionList.js
+++ b/src/data/composite/things/contribution/withContainingReverseContributionList.js
@@ -1,8 +1,12 @@
-// Get the artist's contribution list containing this property.
+// Get the artist's contribution list containing this property. Although that
+// list literally includes both dated and dateless contributions, here, if the
+// current contribution is dateless, the list is filtered to only include
+// dateless contributions from the same immediately nearby context.
 
 import {input, templateCompositeFrom} from '#composite';
 
-import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {raiseOutputWithoutDependency, withResultOfAvailabilityCheck}
+  from '#composite/control-flow';
 import {withPropertyFromObject} from '#composite/data';
 
 import withContributionArtist from './withContributionArtist.js';
@@ -34,7 +38,43 @@ export default templateCompositeFrom({
       object: '#artist',
       property: input('artistProperty'),
     }).outputs({
-      ['#value']: '#containingReverseContributionList',
+      ['#value']: '#list',
     }),
+
+    withResultOfAvailabilityCheck({
+      from: 'date',
+    }).outputs({
+      ['#availability']: '#hasDate',
+    }),
+
+    {
+      dependencies: ['#hasDate', '#list'],
+      compute: (continuation, {
+        ['#hasDate']: hasDate,
+        ['#list']: list,
+      }) =>
+        (hasDate
+          ? continuation.raiseOutput({
+              ['#containingReverseContributionList']:
+                list.filter(contrib => contrib.date),
+            })
+          : continuation({
+              ['#list']:
+                list.filter(contrib => !contrib.date),
+            })),
+    },
+
+    {
+      dependencies: ['#list', 'thing'],
+      compute: (continuation, {
+        ['#list']: list,
+        ['thing']: thing,
+      }) => continuation({
+        ['#containingReverseContributionList']:
+          (thing.album
+            ? list.filter(contrib => contrib.thing.album === thing.album)
+            : list),
+      }),
+    },
   ],
 });
diff --git a/src/data/composite/things/track-section/index.js b/src/data/composite/things/track-section/index.js
index 3202ed49..f11a2ab5 100644
--- a/src/data/composite/things/track-section/index.js
+++ b/src/data/composite/things/track-section/index.js
@@ -1 +1,3 @@
 export {default as withAlbum} from './withAlbum.js';
+export {default as withContinueCountingFrom} from './withContinueCountingFrom.js';
+export {default as withStartCountingFrom} from './withStartCountingFrom.js';
diff --git a/src/data/composite/things/track-section/withContinueCountingFrom.js b/src/data/composite/things/track-section/withContinueCountingFrom.js
new file mode 100644
index 00000000..0ca52b6c
--- /dev/null
+++ b/src/data/composite/things/track-section/withContinueCountingFrom.js
@@ -0,0 +1,25 @@
+import {templateCompositeFrom} from '#composite';
+
+import withStartCountingFrom from './withStartCountingFrom.js';
+
+export default templateCompositeFrom({
+  annotation: `withContinueCountingFrom`,
+
+  outputs: ['#continueCountingFrom'],
+
+  steps: () => [
+    withStartCountingFrom(),
+
+    {
+      dependencies: ['#startCountingFrom', 'tracks'],
+      compute: (continuation, {
+        ['#startCountingFrom']: startCountingFrom,
+        ['tracks']: tracks,
+      }) => continuation({
+        ['#continueCountingFrom']:
+          startCountingFrom +
+          tracks.length,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/track-section/withStartCountingFrom.js b/src/data/composite/things/track-section/withStartCountingFrom.js
new file mode 100644
index 00000000..ef345327
--- /dev/null
+++ b/src/data/composite/things/track-section/withStartCountingFrom.js
@@ -0,0 +1,64 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withNearbyItemFromList, withPropertyFromObject} from '#composite/data';
+
+import withAlbum from './withAlbum.js';
+
+export default templateCompositeFrom({
+  annotation: `withStartCountingFrom`,
+
+  inputs: {
+    from: input({
+      type: 'number',
+      defaultDependency: 'startCountingFrom',
+      acceptsNull: true,
+    }),
+  },
+
+  outputs: ['#startCountingFrom'],
+
+  steps: () => [
+    {
+      dependencies: [input('from')],
+      compute: (continuation, {
+        [input('from')]: from,
+      }) =>
+        (from === null
+          ? continuation()
+          : continuation.raiseOutput({'#startCountingFrom': from})),
+    },
+
+    withAlbum(),
+
+    raiseOutputWithoutDependency({
+      dependency: '#album',
+      output: input.value({'#startCountingFrom': 1}),
+    }),
+
+    withPropertyFromObject({
+      object: '#album',
+      property: input.value('trackSections'),
+    }),
+
+    withNearbyItemFromList({
+      list: '#album.trackSections',
+      item: input.myself(),
+      offset: input.value(-1),
+    }).outputs({
+      '#nearbyItem': '#previousTrackSection',
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#previousTrackSection',
+      output: input.value({'#startCountingFrom': 1}),
+    }),
+
+    withPropertyFromObject({
+      object: '#previousTrackSection',
+      property: input.value('continueCountingFrom'),
+    }).outputs({
+      '#previousTrackSection.continueCountingFrom': '#startCountingFrom',
+    }),
+  ],
+});
diff --git a/src/data/composite/things/track/index.js b/src/data/composite/things/track/index.js
index 32c72f78..e789e736 100644
--- a/src/data/composite/things/track/index.js
+++ b/src/data/composite/things/track/index.js
@@ -1,15 +1,17 @@
 export {default as exitWithoutUniqueCoverArt} from './exitWithoutUniqueCoverArt.js';
-export {default as inheritContributionListFromOriginalRelease} from './inheritContributionListFromOriginalRelease.js';
-export {default as inheritFromOriginalRelease} from './inheritFromOriginalRelease.js';
-export {default as withAlbum} from './withAlbum.js';
+export {default as inheritContributionListFromMainRelease} from './inheritContributionListFromMainRelease.js';
+export {default as inheritFromMainRelease} from './inheritFromMainRelease.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';
-export {default as withOriginalRelease} from './withOriginalRelease.js';
+export {default as withMainRelease} from './withMainRelease.js';
 export {default as withOtherReleases} from './withOtherReleases.js';
 export {default as withPropertyFromAlbum} from './withPropertyFromAlbum.js';
-export {default as withPropertyFromOriginalRelease} from './withPropertyFromOriginalRelease.js';
+export {default as withPropertyFromMainRelease} from './withPropertyFromMainRelease.js';
 export {default as withSuffixDirectoryFromAlbum} from './withSuffixDirectoryFromAlbum.js';
 export {default as withTrackArtDate} from './withTrackArtDate.js';
+export {default as withTrackNumber} from './withTrackNumber.js';
diff --git a/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js b/src/data/composite/things/track/inheritContributionListFromMainRelease.js
index f4ae3ddb..89252feb 100644
--- a/src/data/composite/things/track/inheritContributionListFromOriginalRelease.js
+++ b/src/data/composite/things/track/inheritContributionListFromMainRelease.js
@@ -1,5 +1,5 @@
-// Like inheritFromOriginalRelease, but tuned for contributions.
-// Recontextualized contributions for this track.
+// Like inheritFromMainRelease, but tuned for contributions.
+// Recontextualizes contributions for this track.
 
 import {input, templateCompositeFrom} from '#composite';
 
@@ -9,36 +9,36 @@ import {withRecontextualizedContributionList, withRedatedContributionList}
   from '#composite/wiki-data';
 
 import withDate from './withDate.js';
-import withPropertyFromOriginalRelease
-  from './withPropertyFromOriginalRelease.js';
+import withPropertyFromMainRelease
+  from './withPropertyFromMainRelease.js';
 
 export default templateCompositeFrom({
-  annotation: `inheritContributionListFromOriginalRelease`,
+  annotation: `inheritContributionListFromMainRelease`,
 
   steps: () => [
-    withPropertyFromOriginalRelease({
+    withPropertyFromMainRelease({
       property: input.thisProperty(),
       notFoundValue: input.value([]),
     }),
 
     raiseOutputWithoutDependency({
-      dependency: '#isRerelease',
+      dependency: '#isSecondaryRelease',
       mode: input.value('falsy'),
     }),
 
     withRecontextualizedContributionList({
-      list: '#originalValue',
+      list: '#mainReleaseValue',
     }),
 
     withDate(),
 
     withRedatedContributionList({
-      list: '#originalValue',
+      list: '#mainReleaseValue',
       date: '#date',
     }),
 
     exposeDependency({
-      dependency: '#originalValue',
+      dependency: '#mainReleaseValue',
     }),
   ],
 });
diff --git a/src/data/composite/things/track/inheritFromOriginalRelease.js b/src/data/composite/things/track/inheritFromMainRelease.js
index 38ab06be..b1cbb65e 100644
--- a/src/data/composite/things/track/inheritFromOriginalRelease.js
+++ b/src/data/composite/things/track/inheritFromMainRelease.js
@@ -1,9 +1,9 @@
 // Early exits with the value for the same property as specified on the
-// original release, if this track is a rerelease, and otherwise continues
+// main release, if this track is a secondary release, and otherwise continues
 // without providing any further dependencies.
 //
-// Like withOriginalRelease, this will early exit (with notFoundValue) if the
-// original release is specified by reference and that reference doesn't
+// Like withMainRelease, this will early exit (with notFoundValue) if the
+// main release is specified by reference and that reference doesn't
 // resolve to anything.
 
 import {input, templateCompositeFrom} from '#composite';
@@ -11,11 +11,11 @@ import {input, templateCompositeFrom} from '#composite';
 import {exposeDependency, raiseOutputWithoutDependency}
   from '#composite/control-flow';
 
-import withPropertyFromOriginalRelease
-  from './withPropertyFromOriginalRelease.js';
+import withPropertyFromMainRelease
+  from './withPropertyFromMainRelease.js';
 
 export default templateCompositeFrom({
-  annotation: `inheritFromOriginalRelease`,
+  annotation: `inheritFromMainRelease`,
 
   inputs: {
     notFoundValue: input({
@@ -24,18 +24,18 @@ export default templateCompositeFrom({
   },
 
   steps: () => [
-    withPropertyFromOriginalRelease({
+    withPropertyFromMainRelease({
       property: input.thisProperty(),
       notFoundValue: input('notFoundValue'),
     }),
 
     raiseOutputWithoutDependency({
-      dependency: '#isRerelease',
+      dependency: '#isSecondaryRelease',
       mode: input.value('falsy'),
     }),
 
     exposeDependency({
-      dependency: '#originalValue',
+      dependency: '#mainReleaseValue',
     }),
   ],
 });
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
new file mode 100644
index 00000000..891db102
--- /dev/null
+++ b/src/data/composite/things/track/withAllReleases.js
@@ -0,0 +1,46 @@
+// Gets all releases of the current track. All items of the outputs are
+// distinct Track objects; one track is the main release; all else are
+// secondary releases of that main release; and one item, which may be
+// the main release or one of the secondary releases, is the current
+// track. The results are sorted by date, and it is possible that the
+// main release is not actually the earliest/first.
+
+import {input, templateCompositeFrom} from '#composite';
+import {sortByDate} from '#sort';
+
+import {withPropertyFromObject} from '#composite/data';
+
+import withMainRelease from './withMainRelease.js';
+
+export default templateCompositeFrom({
+  annotation: `withAllReleases`,
+
+  outputs: ['#allReleases'],
+
+  steps: () => [
+    withMainRelease({
+      selfIfMain: input.value(true),
+      notFoundValue: input.value([]),
+    }),
+
+    // We don't talk about bruno no no
+    // Yes, this can perform a normal access equivalent to
+    // `this.secondaryReleases` from within a data composition.
+    // Oooooooooooooooooooooooooooooooooooooooooooooooo
+    withPropertyFromObject({
+      object: '#mainRelease',
+      property: input.value('secondaryReleases'),
+    }),
+
+    {
+      dependencies: ['#mainRelease', '#mainRelease.secondaryReleases'],
+      compute: (continuation, {
+        ['#mainRelease']: mainRelease,
+        ['#mainRelease.secondaryReleases']: secondaryReleases,
+      }) => continuation({
+        ['#allReleases']:
+          sortByDate([mainRelease, ...secondaryReleases]),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/things/track/withAlwaysReferenceByDirectory.js b/src/data/composite/things/track/withAlwaysReferenceByDirectory.js
index 26c5ba97..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'),
     }),
 
@@ -51,7 +41,7 @@ export default templateCompositeFrom({
 
     // Remaining code is for defaulting to true if this track is a rerelease of
     // another with the same name, so everything further depends on access to
-    // trackData as well as originalReleaseTrack.
+    // trackData as well as mainReleaseTrack.
 
     exitWithoutDependency({
       dependency: 'trackData',
@@ -60,45 +50,46 @@ export default templateCompositeFrom({
     }),
 
     exitWithoutDependency({
-      dependency: 'originalReleaseTrack',
+      dependency: 'mainReleaseTrack',
       value: input.value(false),
     }),
 
-    // It's necessary to use the custom trackOriginalReleasesOnly find function
+    // It's necessary to use the custom trackMainReleasesOnly find function
     // here, so as to avoid recursion issues - the find.track() function depends
     // on accessing each track's alwaysReferenceByDirectory, which means it'll
     // hit *this track* - and thus this step - and end up recursing infinitely.
-    // By definition, find.trackOriginalReleasesOnly excludes tracks which have
-    // an originalReleaseTrack update value set, which means even though it does
+    // By definition, find.trackMainReleasesOnly excludes tracks which have
+    // an mainReleaseTrack update value set, which means even though it does
     // still access each of tracks' `alwaysReferenceByDirectory` property, it
     // won't access that of *this* track - it will never proceed past the
     // `exitWithoutDependency` step directly above, so there's no opportunity
     // for recursion.
     withResolvedReference({
-      ref: 'originalReleaseTrack',
+      ref: 'mainReleaseTrack',
       data: 'trackData',
-      find: input.value(find.trackOriginalReleasesOnly),
+      find: input.value(find.trackMainReleasesOnly),
     }).outputs({
-      '#resolvedReference': '#originalRelease',
+      '#resolvedReference': '#mainRelease',
     }),
 
     exitWithoutDependency({
-      dependency: '#originalRelease',
+      dependency: '#mainRelease',
       value: input.value(false),
     }),
 
     withPropertyFromObject({
-      object: '#originalRelease',
+      object: '#mainRelease',
       property: input.value('name'),
     }),
 
     {
-      dependencies: ['name', '#originalRelease.name'],
+      dependencies: ['name', '#mainRelease.name'],
       compute: (continuation, {
         name,
-        ['#originalRelease.name']: originalName,
+        ['#mainRelease.name']: mainReleaseName,
       }) => continuation({
-        ['#alwaysReferenceByDirectory']: name === originalName,
+        ['#alwaysReferenceByDirectory']:
+          name === mainReleaseName,
       }),
     },
   ],
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/withOriginalRelease.js b/src/data/composite/things/track/withMainRelease.js
index 7aefc64a..3a91edae 100644
--- a/src/data/composite/things/track/withOriginalRelease.js
+++ b/src/data/composite/things/track/withMainRelease.js
@@ -1,7 +1,7 @@
-// Just includes the original release of this track as a dependency.
-// If this track isn't a rerelease, then it'll provide null, unless the
-// {selfIfOriginal} option is set, in which case it'll provide this track
-// itself. This will early exit (with notFoundValue) if the original release
+// Just includes the main release of this track as a dependency.
+// If this track isn't a secondary release, then it'll provide null, unless
+// the {selfIfMain} option is set, in which case it'll provide this track
+// itself. This will early exit (with notFoundValue) if the main release
 // is specified by reference and that reference doesn't resolve to anything.
 
 import {input, templateCompositeFrom} from '#composite';
@@ -12,42 +12,42 @@ import {withResolvedReference} from '#composite/wiki-data';
 import {soupyFind} from '#composite/wiki-properties';
 
 export default templateCompositeFrom({
-  annotation: `withOriginalRelease`,
+  annotation: `withMainRelease`,
 
   inputs: {
-    selfIfOriginal: input({type: 'boolean', defaultValue: false}),
+    selfIfMain: input({type: 'boolean', defaultValue: false}),
     notFoundValue: input({defaultValue: null}),
   },
 
-  outputs: ['#originalRelease'],
+  outputs: ['#mainRelease'],
 
   steps: () => [
     withResultOfAvailabilityCheck({
-      from: 'originalReleaseTrack',
+      from: 'mainReleaseTrack',
     }),
 
     {
       dependencies: [
         input.myself(),
-        input('selfIfOriginal'),
+        input('selfIfMain'),
         '#availability',
       ],
 
       compute: (continuation, {
         [input.myself()]: track,
-        [input('selfIfOriginal')]: selfIfOriginal,
+        [input('selfIfMain')]: selfIfMain,
         '#availability': availability,
       }) =>
         (availability
           ? continuation()
           : continuation.raiseOutput({
-              ['#originalRelease']:
-                (selfIfOriginal ? track : null),
+              ['#mainRelease']:
+                (selfIfMain ? track : null),
             })),
     },
 
     withResolvedReference({
-      ref: 'originalReleaseTrack',
+      ref: 'mainReleaseTrack',
       find: soupyFind.input('track'),
     }),
 
@@ -63,7 +63,7 @@ export default templateCompositeFrom({
         ['#resolvedReference']: resolvedReference,
       }) =>
         continuation({
-          ['#originalRelease']: resolvedReference,
+          ['#mainRelease']: resolvedReference,
         }),
     },
   ],
diff --git a/src/data/composite/things/track/withOtherReleases.js b/src/data/composite/things/track/withOtherReleases.js
index f8c1c3f0..bb3e8983 100644
--- a/src/data/composite/things/track/withOtherReleases.js
+++ b/src/data/composite/things/track/withOtherReleases.js
@@ -1,8 +1,9 @@
-import {input, templateCompositeFrom} from '#composite';
+// Gets all releases of the current track *except* this track itself;
+// in other words, all other releases of the current track.
 
-import {exitWithoutDependency} from '#composite/control-flow';
+import {input, templateCompositeFrom} from '#composite';
 
-import withOriginalRelease from './withOriginalRelease.js';
+import withAllReleases from './withAllReleases.js';
 
 export default templateCompositeFrom({
   annotation: `withOtherReleases`,
@@ -10,31 +11,16 @@ export default templateCompositeFrom({
   outputs: ['#otherReleases'],
 
   steps: () => [
-    exitWithoutDependency({
-      dependency: 'trackData',
-      mode: input.value('empty'),
-    }),
-
-    withOriginalRelease({
-      selfIfOriginal: input.value(true),
-      notFoundValue: input.value([]),
-    }),
+    withAllReleases(),
 
     {
-      dependencies: [input.myself(), '#originalRelease', 'trackData'],
+      dependencies: [input.myself(), '#allReleases'],
       compute: (continuation, {
         [input.myself()]: thisTrack,
-        ['#originalRelease']: originalRelease,
-        trackData,
+        ['#allReleases']: allReleases,
       }) => continuation({
         ['#otherReleases']:
-          (originalRelease === thisTrack
-            ? []
-            : [originalRelease])
-            .concat(trackData.filter(track =>
-              track !== originalRelease &&
-              track !== thisTrack &&
-              track.originalReleaseTrack === originalRelease)),
+          allReleases.filter(track => track !== thisTrack),
       }),
     },
   ],
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/withPropertyFromOriginalRelease.js b/src/data/composite/things/track/withPropertyFromMainRelease.js
index fd37f6de..393a4c63 100644
--- a/src/data/composite/things/track/withPropertyFromOriginalRelease.js
+++ b/src/data/composite/things/track/withPropertyFromMainRelease.js
@@ -1,8 +1,8 @@
-// Provides a value inherited from the original release, if applicable, and a
-// flag indicating if this track is a rerelase or not.
+// Provides a value inherited from the main release, if applicable, and a
+// flag indicating if this track is a secondary release or not.
 //
-// Like withOriginalRelease, this will early exit (with notFoundValue) if the
-// original release is specified by reference and that reference doesn't
+// Like withMainRelease, this will early exit (with notFoundValue) if the
+// main release is specified by reference and that reference doesn't
 // resolve to anything.
 
 import {input, templateCompositeFrom} from '#composite';
@@ -10,10 +10,10 @@ import {input, templateCompositeFrom} from '#composite';
 import {withResultOfAvailabilityCheck} from '#composite/control-flow';
 import {withPropertyFromObject} from '#composite/data';
 
-import withOriginalRelease from './withOriginalRelease.js';
+import withMainRelease from './withMainRelease.js';
 
 export default templateCompositeFrom({
-  annotation: `inheritFromOriginalRelease`,
+  annotation: `inheritFromMainRelease`,
 
   inputs: {
     property: input({type: 'string'}),
@@ -26,18 +26,18 @@ export default templateCompositeFrom({
   outputs: ({
     [input.staticValue('property')]: property,
   }) =>
-    ['#isRerelease'].concat(
+    ['#isSecondaryRelease'].concat(
       (property
-        ? ['#original.' + property]
-        : ['#originalValue'])),
+        ? ['#mainRelease.' + property]
+        : ['#mainReleaseValue'])),
 
   steps: () => [
-    withOriginalRelease({
+    withMainRelease({
       notFoundValue: input('notFoundValue'),
     }),
 
     withResultOfAvailabilityCheck({
-      from: '#originalRelease',
+      from: '#mainRelease',
     }),
 
     {
@@ -54,14 +54,14 @@ export default templateCompositeFrom({
           ? continuation()
           : continuation.raiseOutput(
               Object.assign(
-                {'#isRerelease': false},
+                {'#isSecondaryRelease': false},
                 (property
-                  ? {['#original.' + property]: null}
-                  : {'#originalValue': null})))),
+                  ? {['#mainRelease.' + property]: null}
+                  : {'#mainReleaseValue': null})))),
     },
 
     withPropertyFromObject({
-      object: '#originalRelease',
+      object: '#mainRelease',
       property: input('property'),
     }),
 
@@ -77,10 +77,10 @@ export default templateCompositeFrom({
       }) =>
         continuation.raiseOutput(
           Object.assign(
-            {'#isRerelease': true},
+            {'#isSecondaryRelease': true},
             (property
-              ? {['#original.' + property]: value}
-              : {'#originalValue': value}))),
+              ? {['#mainRelease.' + property]: value}
+              : {'#mainReleaseValue': value}))),
     },
   ],
 });
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/things/track/withTrackNumber.js b/src/data/composite/things/track/withTrackNumber.js
new file mode 100644
index 00000000..61428e8c
--- /dev/null
+++ b/src/data/composite/things/track/withTrackNumber.js
@@ -0,0 +1,50 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {raiseOutputWithoutDependency} from '#composite/control-flow';
+import {withIndexInList, withPropertiesFromObject} from '#composite/data';
+
+import withContainingTrackSection from './withContainingTrackSection.js';
+
+export default templateCompositeFrom({
+  annotation: `withTrackNumber`,
+
+  outputs: ['#trackNumber'],
+
+  steps: () => [
+    withContainingTrackSection(),
+
+    // Zero is the fallback, not one, but in most albums the first track
+    // (and its intended output by this composition) will be one.
+    raiseOutputWithoutDependency({
+      dependency: '#trackSection',
+      output: input.value({'#trackNumber': 0}),
+    }),
+
+    withPropertiesFromObject({
+      object: '#trackSection',
+      properties: input.value(['tracks', 'startCountingFrom']),
+    }),
+
+    withIndexInList({
+      list: '#trackSection.tracks',
+      item: input.myself(),
+    }),
+
+    raiseOutputWithoutDependency({
+      dependency: '#index',
+      output: input.value({'#trackNumber': 0}),
+    }),
+
+    {
+      dependencies: ['#trackSection.startCountingFrom', '#index'],
+      compute: (continuation, {
+        ['#trackSection.startCountingFrom']: startCountingFrom,
+        ['#index']: index,
+      }) => continuation({
+        ['#trackNumber']:
+          startCountingFrom +
+          index,
+      }),
+    },
+  ],
+});
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 cd6b7ac4..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(null),
-    }),
-
-    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;