I like Classical, Opera (I, Pagliaci and of course, everyones favorite Turandot) but I am woefully ignorant and if tested on actual knowledge on the topic would fail miserably.
Mostly, I listen to a lot of Fifties Music and Doo wop, Classical Rock, modern Rock, Grunge, heavy metal, underground metal... depends on my mood, I guess.
If you walk in and I have Hatebreed or Soulfly blasting, the wise person makes a hasty retreat. It probably means I my mood is definitively lethal.