BadBadNotGood - Earl
You are so Jivin' like it's 1975!
8#Prince - Distorted Princess
Now I've moved on to this:
Gustaf Tivander - Sanctum Original Soundtrack
I played this game all weekend with my cousin. You can stream the OST for free here: http://coffeestainstudios.bandcamp.com/album/sanctum-fps-td-ost
Oh, and I should mention it sounds gorgeous and only costs $0.50 in lossless.