{"projection_revision":2,"snapshot":"652b209e8a4c0fc1ece71e35299ddeda","catalog_version":22556,"snapshot_created_at":"2026-09-30T18:38:17+00:00","snapshot_expires_at":"2026-10-01T18:38:17+00:00","source_changed_at":"2026-09-30T18:33:14+00:00","freshness_behavior":"materialized on first request after a committed source change; database triggers cover row writes and relationship writes","source_id_sha256":"bd560689c31ffbc39f07e91b59c0f3209111e83c8f8f7c7961ed12b50477f852","source_content_sha256":"8ef34e7e97559494dcbfdfeb20bf6e77199a1520f7f34341d3035daea7353d95","total_catalog_pieces":6404,"schema_version":"2.0","query":"","normalized_query":"","resolved_filters":{"collection_id":123,"timezone":"UTC"},"sort":"relevance","projection":"compact","total_matches":155,"returned":5,"page":4,"per_page":50,"total_pages":4,"previous_page_url":"https://roadtovirtuosity.com/ai/catalog.json?collection_id=123&page=3&snapshot=652b209e8a4c0fc1ece71e35299ddeda","next_page_url":null,"end_of_results":true,"alternate_formats":{"html":"https://roadtovirtuosity.com/ai/catalog?collection_id=123&page=4&snapshot=652b209e8a4c0fc1ece71e35299ddeda","json":"https://roadtovirtuosity.com/ai/catalog.json?collection_id=123&page=4&snapshot=652b209e8a4c0fc1ece71e35299ddeda","text":"https://roadtovirtuosity.com/ai/catalog.txt?collection_id=123&page=4&snapshot=652b209e8a4c0fc1ece71e35299ddeda"},"warnings":["Strict taxonomy filters exclude unattributed records; search title text separately before deciding something is missing.","Work identity, musical sequence and completeness are unknown unless reviewed metadata is supplied. Catalog collections are existing subcategory groupings.","Historical first-publication dates are unknown. Date counts include only currently public entries with known first-publication dates.","File availability reports a public file reference, not a storage-health check.","A newer source revision exists. This response preserves the requested/captured snapshot; restart without snapshot for the latest available catalog."],"publication_count_scope":"currently public entries first published during the requested interval","unknown_publication_dates_before_date_filter":108,"distinct_work_count":null,"approximate_suggestions":[],"message":null,"pieces":[{"piece_id":6176,"title":"What Child Is This - Bock's Best Volume III - pg. 40","composer":[],"composers":[],"instrument":["Piano"],"instruments":[{"id":1,"name":"Piano"}],"genre":"1900’s - Present","genre_id":4,"is_archive_only":false,"evaluation_eligible":true,"points":1620,"level":3,"canonical_url":"https://roadtovirtuosity.com/what-child-is-this-bocks-best-volume-iii-pg-40","instrument_points":[{"instrument_id":1,"instrument":"Piano","points":1620}],"collections":[{"id":123,"name":"Hymns - Christmas"}],"collection_semantics":"existing catalog subcategory grouping","work_identifiers":[],"work_id":null,"book":null,"sequence_position":null,"movement_number":null,"movement_title":null,"key":null,"arrangement":null,"edition":null,"entry_scope":null,"completeness":"unknown","reviewed_enrichment":false,"availability_label":"Copyrighted","has_download":false,"download_availability_basis":"public license category and existing file reference; storage health not verified","created_at":"2026-09-22T06:36:18+00:00","first_published_at":"2026-09-22T06:36:18+00:00","published_at":"2026-09-22T06:36:18+00:00","updated_at":"2026-09-22T06:44:16+00:00","match_basis":"filters"},{"piece_id":1344,"title":"What Child Is This? - Intermediate Piano Arrangement No. 1","composer":[],"composers":[],"instrument":["Piano"],"instruments":[{"id":1,"name":"Piano"}],"genre":"Sacred","genre_id":9,"is_archive_only":false,"evaluation_eligible":true,"points":11250,"level":5,"canonical_url":"https://roadtovirtuosity.com/what-child-is-this-intermediate-piano-arrangement","instrument_points":[{"instrument_id":1,"instrument":"Piano","points":11250}],"collections":[{"id":123,"name":"Hymns - Christmas"}],"collection_semantics":"existing catalog subcategory grouping","work_identifiers":[],"work_id":null,"book":null,"sequence_position":null,"movement_number":null,"movement_title":null,"key":null,"arrangement":null,"edition":null,"entry_scope":null,"completeness":"unknown","reviewed_enrichment":false,"availability_label":"Non-Commercial","has_download":true,"download_availability_basis":"public license category and existing file reference; storage health not verified","created_at":"2023-11-08T16:42:25+00:00","first_published_at":null,"published_at":null,"updated_at":"2026-06-12T04:50:38+00:00","match_basis":"filters"},{"piece_id":1715,"title":"What Child Is This? - Intermediate Piano Arrangement No. 5","composer":[],"composers":[],"instrument":["Piano"],"instruments":[{"id":1,"name":"Piano"}],"genre":"Sacred","genre_id":9,"is_archive_only":false,"evaluation_eligible":true,"points":938,"level":2,"canonical_url":"https://roadtovirtuosity.com/what-child-is-this-intermediate-piano-arrangement-no-5","instrument_points":[{"instrument_id":1,"instrument":"Piano","points":938}],"collections":[{"id":62,"name":"Hymns"},{"id":123,"name":"Hymns - Christmas"}],"collection_semantics":"existing catalog subcategory grouping","work_identifiers":[],"work_id":null,"book":null,"sequence_position":null,"movement_number":null,"movement_title":null,"key":null,"arrangement":null,"edition":null,"entry_scope":null,"completeness":"unknown","reviewed_enrichment":false,"availability_label":"Non-Commercial","has_download":true,"download_availability_basis":"public license category and existing file reference; storage health not verified","created_at":"2023-12-22T05:58:29+00:00","first_published_at":null,"published_at":null,"updated_at":"2026-07-29T17:31:44+00:00","match_basis":"filters"},{"piece_id":3515,"title":"What Child Is This? - Intermediate Piano Arrangement No. 6","composer":[],"composers":[],"instrument":["Piano"],"instruments":[{"id":1,"name":"Piano"}],"genre":"Sacred","genre_id":9,"is_archive_only":false,"evaluation_eligible":true,"points":9850,"level":5,"canonical_url":"https://roadtovirtuosity.com/what-child-is-this-intermediate-piano-arrangement-no-6","instrument_points":[{"instrument_id":1,"instrument":"Piano","points":9850}],"collections":[{"id":123,"name":"Hymns - Christmas"}],"collection_semantics":"existing catalog subcategory grouping","work_identifiers":[],"work_id":null,"book":null,"sequence_position":null,"movement_number":null,"movement_title":null,"key":null,"arrangement":null,"edition":null,"entry_scope":null,"completeness":"unknown","reviewed_enrichment":false,"availability_label":"Non-Commercial","has_download":true,"download_availability_basis":"public license category and existing file reference; storage health not verified","created_at":"2024-12-06T15:15:49+00:00","first_published_at":null,"published_at":null,"updated_at":"2026-06-13T15:07:45+00:00","match_basis":"filters"},{"piece_id":6180,"title":"While Shepherds Watched Their Flocks by Night - Bock's Best Volume III - pg. 50","composer":[],"composers":[],"instrument":["Piano"],"instruments":[{"id":1,"name":"Piano"}],"genre":"1900’s - Present","genre_id":4,"is_archive_only":false,"evaluation_eligible":true,"points":4051,"level":4,"canonical_url":"https://roadtovirtuosity.com/while-shepherds-watched-their-flocks-by-night-bocks-best-volume-iii-pg-50","instrument_points":[{"instrument_id":1,"instrument":"Piano","points":4051}],"collections":[{"id":123,"name":"Hymns - Christmas"}],"collection_semantics":"existing catalog subcategory grouping","work_identifiers":[],"work_id":null,"book":null,"sequence_position":null,"movement_number":null,"movement_title":null,"key":null,"arrangement":null,"edition":null,"entry_scope":null,"completeness":"unknown","reviewed_enrichment":false,"availability_label":"Copyrighted","has_download":false,"download_availability_basis":"public license category and existing file reference; storage health not verified","created_at":"2026-09-22T06:37:35+00:00","first_published_at":"2026-09-22T06:37:35+00:00","published_at":"2026-09-22T06:37:35+00:00","updated_at":"2026-09-22T06:45:42+00:00","match_basis":"filters"}],"latest_catalog_version":23456,"source_lag_revisions":900}