I'm sure you have heard of dmoz, the open directory project, which is used on a number of large website including Google. A few of the editors from the open directory project started MusicMoz. I'm sure you can guess what it is. I'm sure its been around for a while, but I just found it today while procrastinating.
Anyway, I think a partnership between your site and theirs could be very, very cool.
To get an idea of what kind of info they have, here's their page for Pink Floyd:
http://musicmoz.org/Bands_and_Artists/P/Pink_Floyd/
Andrew