My favourite genre is rock/pop, but I like different music for different purposes. If I'm relaxing in a chair or on the bed, then I like classical music, but if I want to dance about, then pop/disco songs from the 50s-70s are best.
Reggae and hiphop make me happy. Punk's good for when I'm angry. I also like a bit of pop, some silly mashups (not a genre but I like them), some jazz, blues and the odd bit of classical. Trance music is the best for running to.