All kinds of stuff, some new age mystics (don't know the exact name), for atmosphere. Or just to drive some people up the wall
Metalcore, anything relating to punk and rock, melodic metal. To name a few bands, Asking Alexandria, Atreyu, Papa Roach, Bodyjar, Dead by April, The Used, HIM, Trivium, Billy Talent, Fall out Boy.
Late 90s pop, and I am not ashamed to admit it. Featuring S Club 7, Michelle Branch, Ace of Base (one album each).
There are also bands which I could place into the emo genre, like Panic! or MCR, plus some bands of the above, but they could equally claim belonging other genres.
A little Italian can't hurt. Therefore I'll add pop/-punk bands Nek, Vanilla Sky and Zero Assoluto.
I almost forgot classical instruments. Piano, violin, cello... *sigh* and sometimes, though for lack of understanding rarely, I enjoy listening to jazz.