Almost anything, currently listening to Gorillaz but I listen to:
Classical, Jazz, Piano, Rock, Metal, Alternative, J-Pop, Pop.
I can't think of the rest of the top of my head but there's a lot more.
The best thing I've listened to recently is this though, such a good track... never heard of the artist until a few days ago, if you want a really relaxing album to listen to it's called Theater Island, I recommend it: