Hmm,
I mostly like any variety of metal/rock, good old 90's dance and techno, and most of the 80s.
Stuff like: Type O negative, Paradise Lost, Nightwish, Within Temptation, Megadeth, Metallica, Dragonforce, Puddle of Mudd, Guano Apes, Faith No More, Rage Against the Machine, Papa Roach erhm well I can go on for a really long time ^^