Well I can only give you a quick list 'cause I have to go to class so:
Behemoth, (Old)Metallica, Iron Maiden, ZZ Top, Cradle of Filth, God Forbid, Vader, Soilwork, Mushroomhead, Children of Bodom, Shadows Fall, Megadeth, Porcupine Tree, Nile, Machine Head, Lacuna Coil, Alice in Chains, Amon Amarth, Iron Butterfly, In Flames, Iced Earth, Deep Purple, Tantric, Napalm Death, Slayer, Dimmu Borgir, Morbid Angel, Arch Enemy, Blind Guardian, Katatonia, Camel, Pantera, Meshuggah, Ted Nugent, Led Zepplin, Into Eternity, Satyricon, Burzum, Bathory, Testament, At the Gates, Judas Priest, Immortal, Venom, Dream Evil, Mayhem, Nightrage, Hendrix, Heaven Shall Burn, Wintersun, Moonsorrow, Firewind, Finntroll, Scar Symmetry, Insomnium, Ragnarok, etc.