I got a good selection of music just from the front page. Would you consider adding a radio option that's based on a song or an artist, like Pandora and Spotify do?
Have you considered doing a variable pricing model like Amie Street did back in the day? The more popular a track or album is, the more expensive it gets. I think this is a really good model for selling independent music because it rewards all the right people in the right way. If you get an album for an inexpensive price that means you helped 'discover' that artist and you helped them gain popularity (i.e. their price goes up a little). And if you buy an album for the going market price ($9.99 or whatever) that means a lot of other people have already validated that it's good and you know you're getting a good deal. Just a thought.