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MusicBrainz would be really happy to help try and provide the information you want. You should open a ticket at our bug tracker and we'll see what can be done. I might be biased, but I don't think you'll find cleaner metadata information on the interwebs :)

http://developer.rovicorp.com/docs does some of this stuff, albeit it's a bit cumbersome. I'm still using them since they have some metadata available which is unique.

(these are the guys behind http://www.allmusic.com)

We do, but it's not yet released. If you'd be up for it, I'd love some feedback. Hit me up at cnunciato@rhapsody.com.