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Oathean Oathean Oberon Oberon Oberon Oberon Obeyer Obituary [Official] Obituary Obituary Obliveon Obscenity Obscenity Obsesia Obsession Obtained Enslavement Occult occupational hazard Ocean Machine Octagon October 31 October Tide Odes of Ecstasy Odes of Ecstasy Odeum Odhinn Odium Offense Officium Triste Offspring Oktagon O.L.D. Old Man's Child Old Man's Child Old Monks' Saga Old Monks' Saga Old Serpent Old Serpent Olemus Omen Ominous Ominous Ominous Grief Omnium Gatherum Opera IX Opera IX Opeth [official] Opeth Opeth Opeth Opeth Ophthalamia Opposite Earth Oppressor Orange Goblin Ora Pro Nobis Oratory Ordeal Order from Chaos Order of Nine Angels Ordo Draconis Ordo Equilibrio Ordo Equilibrio Ordo Equilibrio Orphanage [official] Orphanage Orphaned Land Orphaned Land Orpheus Osh Osiris of Cadavers Ossian Otyg Ouija Our Souls Overdose Overkill Overkill Overkill Overlord Overkill Overmars Ozzy Osbourne [Official] Ozzy Osbourne Ozzy Osbourne