Upon doing a bit of research, the answer to my question is: artist, album, and album artist ("artist" being song artist). Slightly different for compilations (I think it ignores the artist fields, but don't know if it ignores both). A frequent point on doing this research is to watch out for invisible characters. So I would say: add some invisible characters. Try putting a space on the end or something. Let us know how it works, I'm booted into linux right now, so can't try it -- I usually only boot up into Windows for iTunes once a week on weekends.