Hey, I poked around and didn't see one. [Please tell me if you know there is an existing one!]
So I decided to make one. If you don't know what last.fm is, it is basically a large music community with forums and profiles with a vast database of both uncommon and popular artists. Unless you are looking for your friend's grungy garage band's album, they probably have most any artist you can think of. You can download a scrobbling software that scrobbles, or keep track of the music you listen to whilst on your computer. It doesn't really serve much of a points function or whatnot, but it helps you compare your musical compatibility with other members on the site. I think it's pretty nifty. Anyways, here we are:
Typology Central – Group at Last.fm
This is my profile:
Please join and leave a shout in the comment box saying who you are.