A lot if stuff. Although I tend to listen to a lot of soundtracks. Preferably things from Lord of the Rings and of course Audiomachine, Two Steps from Hell, and Brand X Music.
My two favourite bands are Faith No More and Katatonia. I could basically listen to those two on shuffle forever.
Apart from that, I must admit that I have a soft spot for Maroon 5 and, of course, Michael Jackson.