Heavy Metal:
Iron Maiden.... I think thats it here I should check some more out

Black metal:
Immortal
Dimmu Borgir
Windir(my favorite)
Darkthrone
Emperor
Gorgoroth

Death metal:
Death
Cryptopsy
Quo Vadis
Martyr
Spiral Architect
Morbid Angel
Necrophagist
Opeth
In Flames (to clayman)
Amon Amarth
Children Of Bodom? I don't think they count in here but oh well
Dark tranquility
Dimension Zero

Power:
Iced Earth
Blind Guardian
Demons and Wizards

Grind:
Cannibal Corpse I don't know if they would be grind or death...
Carcass!
Anal Cunt, these guys are hilarious

Thrash:
Old metallica, didn't see that one coming
Megadeth
Slayer

Others:
Dream Theater
Lamb of God
and others...