greatest band of all time: OPETH (of course )

Black:
ANOREXIA NERVOSA
Astrofaes
Burzum
Mayhem
Ragnarok
Gorgoroth
Emperor
dear old Darkthrone

Death, Grind, Goregrind etc:
THE KILL
Brujeria
Cannibal Corpse
Angel Corpse
Decapitated
Devolved
The Berzerker
Mortician
Vader
Cryptopsy
Psycroptic
Suffo
Captain Cleanoff
Abramelin
Blood Duster
Intense Hammer Rage
Day Everything Became Nothing
Fuck...I'm Dead
Resurrected

Thrash:
CARNAL FORGE
The Haunted
Dew-Scented
Slayer
Metallica
Megadeth
Testament

Heavy:
8 Foot Sativa
Frankenbok
Pantera
SYL

Melodic Death:
AMON AMARTH
Dawn
Dissection
At The Gates
Dark Tranq


Other bands I like:
Queen
Dream Theater
Ash
Tom Petty
Nightwish
Bruce Dickinson