I listen to almost everything. I would have to say my favorite genre is Deathcore. Other genres I listen to: Metalcore, Melo Death, Death Metal, Grindcore, Sludge Metal, Post Hard Core, Hard Core, Thrash Metal, Punk, Garage Punk, Power Metal, Heavy Metal, Black Metal, Doom Metal, Progressive Metal, Progressive Rock, Math core, Gothic Metal, Gothic Rock, Orchestral, Symphonic Metal, Alternative Metal, Alternative Rock, Alternative, Industrial, Industrial Rock, Industrial Metal, Rap Metal, Nu Metal, Speed Metal, Stoner Metal, Grundge, Cello Metal (Oh gawd I love this stuff.) Rock, Pop, Emo, Indie, Hard Rock, Trance, Dubstep, Drumstep, Drum & Bass, Noise, House, Progressive House. I might be missing something; I just went looking through all my Pandora stations, seeing what bands there are in there.
Edit: 8-Bit and Crunk Core, How could I forget those!