From MusicBrainz Wiki

Given two songs, AAA and BBB, where we're looking for any relationship from BBB to AAA:

  • Is BBB the same Work as AAA?
  • No: Stop; no relationship exists between AAA and BBB.
  • Yes: Does the medley contain AAA?
  • Is BBB the same Work as AAA?
  • Yes: Is BBB performed by the same Artist as the one who performed AAA?
  • Yes: Is BBB on the same Release as AAA?
  • No: Is BBB a remix of AAA?