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