Artist coverage and remaining work

The fixed 145-artist priority roster is retained from the completed v3.2 release. Its original selection used at least 10 distinct retained annual recording references, 16 editorial additions, and previously published collections. New optional collections are reported separately and do not expand this completion denominator. Short collections are acceptable, and prolific catalogs may exceed 50 songs.

4,277 retained annual-credit IDs include joint credits, featured performers and spelling variants. 352 link to a published performer collection. These raw credit counts are not a count of missing individual artists.