https://musicbrainz.org/doc/MusicBrainz_Database/Schema
10+ years ago at Zvooq, during the golden age of music metadata and recsys startups, we tried to really solve entity resolution in the domain. I've never seen another streaming service make an honest attempt at this, even at Spotify with their 2014 acquihire of the Echo Nest. You still get Utada and Hikaru Utada as ~completely separate entities