Hey again, guys. Thanks for all the responses. To the best of my knowledge, the Fuze makes no use of the composer tag. Also, while I have more 'classical' music than the average bear, I don't think it's enough to merit splitting it up further by genre. Basically, I want my genre tags in order so I can listen to a lot of one type of music on random. FWIW, I'm doing the same thing with my other genres. Hardcore, Crust, Rapcore, and some Rock (Patti Smith and Television) have all been compressed into 'Punk' for the sake of this player. Dunno if I'm gonna break New Wave up into Synthpop and Post-Punk, yet. It's gonna be about making things easily searchable on the player, with no one genre only having one or two groups in it, nor being so large that it's an honest pain to thumb through. Getting my tags consistent (especially genre, which is so subjective) is gonna be a work in progress, I can tell.
As for artist/composer/album tribulations: I haven't put it into effect yet, but I think I'm gonna set up a double standard for now. I might put composer as artist for albums that consist solely of that composer's music. I think for albums where one artist plays works by several composers, I might list the artist/conductor/soloist as the artist and put the composer in the album tag with the piece. The main problem is that I'm not such a classical enthusiast that I amass multiple copies of the same works by different people/on different labels, and also I'm less likely to remember who did what/what's on a different album.
Still feeling a little stuck, but I'm working through the links everyone posted. Thanks again.