Well... it's a neat concept...
Yeah, good idea - except... well, you kinda did a half-assed job of it. I mean, no offense, I can tell you put some work in to this, but there really needs to be more.
It'd be better to have the main genre screen, right, and then an example for each sub-genre... for instance, electronic. You could keep the Infected Mushroom for GOA, use Freezepop for Synthpop, and Future Sound of London for Ambient. See?
Here's another thought - only preload the interface. When the view clicks on a genre, have it preload that. That was you won't have to load genres that you aren't going to listen to.
Oh, and the sound quality of the samples would be a good thing to increase... otherwise, you don't get a very accurate idea of what the song sounds like.
And then, of course, there's the one glaring problem with your 'sampler' - all of those bands are pretty 'mainstream' within their genres. I mean - you should be showcasing lesser-known bands, right? Bands people haven't already heard?
One more little thing - 'game' isn't a genre. It really isn't.