I'm not sure what the situation is with the site being updated and whatnot (I think its been dead for awhile and recently revived). But anyways, it's a great way to find new bands. You'll find rock & indie rock mostly. Also jazz, electronica, and some other genres. It's completely legal, there are 1-3 songs for each band that you can listen to on the site or download as an mp3.
I'm always searching for new music, and I find this site to be a really great way to do so. From here, I usually download more of their music illegally or attempt to find them at a CD store (which is usually nearly impossible).
If you're interested
Click Here. If you want to listen/download you'll have to register.