I started from watching mtv, punk rock, pop shit (can't fathom how that happened, looking back at it now). After that i got my hands on some old scool hip hop and that was my stuff for about 6-7 years. Organized Konfusion, A tribe Called Quest, Wu-tang, De La Soul, West Coast G-funk, East Coast underground, and too many favorites over the years to mention. Then i started to learn piano about 2 years ago ~ and as such it steered me into learning about improvising, then composing and thus listening to Jazz and even Classical (which is a strange term, considering some compositions), so as of now my biggest favorite would probably be Charles Mingus - as his personality and music has such fire and flavor, it's a joy to listen, though not for everyday use.
Come to think of it, now that i'm learning to write my own stuff, i don't listen to too much music, it's kind of sad really, as i would constantly terrorize my neighbours a few years ago.