Aw, c'mon. They probably worked their ass off to get those artists to sign up with them before the site even launched. Watch a band like Radiohead or NIN give 'em a wink and it will blow up like stove top jiffy pop.
Also, my 2c on the site design: Its trendy and neat, but off-white, sans-serif font on a black background makes for a hard read. Otherwise I like it. Minimalism, hoo-rah.
I love the concept. I hope it takes off like crazy! And I think it will.