How should classical releases with different composers and performers (as in the original post) be tagged? Composer makes the most sense as the "artist", but what's standard?
There's a 'Composer' tag for a reason, you know. The Artist tag should be the performer.
Most last.fm people disagree but those people are less fun to be around than I am so they are wrong. Their approach is to tag the composer in the "Artist" field and the artist in "some other field". I mean that's theoretically ok (ignoring the fact that there is a
perfectly good ID3 tag called 'Composer') because you still retain all the information, but the biggest issue is the fact that I do not want to have to retag 3000 tracks just because last.fm doesn't work the way it should.
So yeah, put the composer's name in the Composer tag, and the artist's name in the Artist tag. Pretty self-evident really.