I like everything musically. And I am not one of those people who just says that and listens to only rock and rap...
I listen to everything from Tchaikovsky to Wyclef Jean to 2Pac to Dispatch to Apocalyptica to Soundgarden and back to Smetana ... you get the idea.
There is one small caveat I guess - I rarely have found a country music song from the last 3 decades I enjoy (a few exceptions - Randy Travis.. that is all I can think of now, though there are others heh). Go back to old, old country artists like Charlie Pride and Hank Williams (the first one) and there is some great music.
Oh and I hate Jazz - I know people say you have to have refined musical taste, or be musically inclined to understand it but I guess I dont have that, because Jazz has always sounded pretty awful to me. I do love the blues though
Oh and techno is only good in certain instances