Rock.
Classic Rock.
Metal.
European Metal.
Alternative.
Industrial.
Techno industrial (club music).
Some 60 & 70's singer/songwriters and story tellers.

80's Retro.
Crossover rap/rock like Linkin Park and the newer Cypress Hill.
Classical.
Ambient.

Etc etc..

I have a fairly wide range of musical interests. Just no ghetto rap, hip hop, or new country.