Oldschool/Heavy metal: Iron Maiden
Thrash Metal: Kreator
Death Metal: Nile
Black Metal: The Amenta
Melodic Death Metal: Dark Tranquility
Power Metal: Dragonforce
Prog Metal: Nevermore
Doom Metal: i dunno.
Tech Metal: Cryptopsy
Grindcore: Cephalic Carnage
Metalcore: Despised Icon