My itunes is pretty full of a mix of mainly 70s-90s rock, mixed with classical music best-ofs and some video game OSTs. The only newish music is Florence and the Machine. I like different music, as it's more of an inspiration to mix it up, so I have things like the Housemartins (a capella), Jeremy Soule (Guild Wars), Elbow, Cranberries, and the soundtracks to films like the Wedding Singer or Teachers.
...so in short, anything and everything, but always something different. I get annoyed listening to the same thing too much.