Feature description:
These are fairly standard ID3v2 and Vorbis Comments. It would be great if they were supported similar to composer. Conductor, especially, is quite well handled by MusicBrainz.
Problem solved:
Distinguish between different artist roles.
Brought benefits:
Organizing and identifying music more precisely than putting them all as artists.
Other application solutions:
Additional description and context:
Screenshots / Mockup: