I listen to Hard Rock, Instrumental Metal ("Instrumetal"), Instrumental Rock, and Metal. For the past ten years I've primarily listened to Black Metal, and Death Metal and it even sounds lite/easy listening to me now - nothing is heavy enough anymore.
This isn't even close to all the stuff I like since I have over 2000 audio CD's:
Accept, Amorphis, Benediction, Black Sabbath, Bolt Thrower, Candlemass, Cannibal Corpse, Carcass, Cathedral, Coroner, Danzig, Death, Demolition Hammer, Dimmu Borgir, Dio, Dismember, Grave, Grip Inc., Emperor, Entombed (their old stuff when they played death metal), HammerFall, Hypocrisy, Incantation, Jason Becker, Joe Satriani, Judas Priest, Kreator, King Diamond, Mayhem, Mercyful Fate, Meshuggah, Moonspell, Morbid Angel, Motorhead, MSG, Napalm Death, Nevermore, Overkill, Ozzy Osbourne, Paradise Lost (up to the 1995 release Draconian Times), Primus, Pungent Stench, Raise Hell, Samael, Savatage, Six Feet Under, Slaughter (Canada) (no not the glam-metal band from the late 80's-90's), Slayer, Steve Vai, Tiamat, Trouble, Type O Negative, Unleashed, Vinnie Moore, Vision Of Disorder, Yngwie Malmsteen