METAL, HEAVY %&#* METAL...
Hammerfall, MOTORHEAD, MANOWAR, DIO,Gamma Ray, Goat Horn, Anvil, Omen, Grim Reaper, Primal Fear, that kind of stuff mostly floats my Battleship...
Bein a musician though I really dig a lot of stuff- early modal jazz (and some of the freak/free stuff from the early 60's) OLD blues (like what Bugweed mentioned, Lonnie Johnson, Robert Johnson, Mississippi John Hurt, Leadbelly) reggae (Burning Spear is my fave of the older stuff, or really early Wailers when they were still doing rocksteady)
And I like most classic rock, from Deep Purple(I know, sort of a heavy metal band too),Thin Lizzy and Queen (ALMOST got all of their stuff on CD WOOOO!!!) to newer stuff like Motley Crue and GnR and stuff
Everything but "urban music" and new country (oh, and Nu metal isn't worth the name, since it don't make ya nuts)