Artists Beginning With "O"

O.S.I.	Onslaught
Oath to Vanquish	Open Hand
Obelyskkh	Operation Downfall
Obituary	Opeth
Obliteration	Ophiolatry
Obscenity	Ophis
Obscura	Opia
Obscure	Opitz
Obsequiae	Opprobrium
Obsidian Aspect	Oracle of the Void
Ocean Grove	Orange Goblin
Ocean, The	Orangeburg Massacre, The
Oceano	Orchid Ablaze
Oceans of Slumber	Orchid's Curse
Oceansize	Ordeal
Octavia Sperati	Orden Ogan
October File	Order of Chaos
October Tide	Order of Ennead
Of Mice and Men	Order of Izaz
Of the Archaengel	Order of Voices
Ogre	Order, The
Ohgr	Origin
Ohhms	Orodruin
Old	Orphaned Land
Old Corpse Road	Orpheus Omega
Old Man's Child	OSI
Old Silver Key	Oslo Ess
Old Wainds	Ostura
Om	Otargos
Omega Crom	Otep
Omen, The	Our Last Enemy
Omision	Our Last Night
Omnium Gatherum	Ouroboros
On Broken Wings	Outbreak
On the Edge of the Netherrealm	Outcast
On the Last Day	Overcast
On Top	Overkill
One Man Army and the Undead Quartet	Overtures
One Step Beyond	Owl
One Without	Ozzy Osbourne
One-Way Mirror