I think you could use amg.pl (Allmusic) or discogs.pl (Discogs, obviously) via MCUtils. I use amg.pl all the time, and if you set up to grab the "Credits," you can likely get what you're looking for, assuming an individual album's credits list contributing musicians, which you could then search via whatever field you send amg's credits to.
MCUtils has a bit of a learning curve, but once you get it set up, it's great for this kind of thing.
