Really, it depends on my mood. If you look at the collection in my CD player (5 disc changer) you'll see the following: Wumpscut, She Wants Revenge, Metallica, Alien Ant Farm, and 311.
I tend to vary my music by my mood, like I said earlier. From Rise Against, to Gackt, to CCR, and many more. If I were to list all the bands I like, I'm pretty sure I'd reach the post text limit (if there is one) quite easily.