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OA
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| The OATH - OATHBREAKER |
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OB
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| OBITUARY - OBITUS - OBLIQUE RAIN - OBLITERATE - OBSCENE EXTREME FESTIVAL |
| OBSCENITY - OBSCURA - OBSCURE SPHINX - OBSCURO - OBSEQUIAE |
| The OBSESSED - OBSESSION - OBSIDIAN GATE - OBSIDIAN KINGDOM - OBSIDIOUS |
| OBTAINED ENSLAVEMENT - OBTENEBRIS - OBTEST - OBÚS |
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OC
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| OCÉAN - The OCEAN - OCEANS ATE ALASKA - OCEANS OF SLUMBER - OCTAVIA SPERATI |
| OCTOBER FALLS - OCTOBER TIDE - OCTOPLOID |
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OD
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| ODAL - ODD DIMENSION - ODD LOGIC - ODIOUS - ODIOUS MORTEM |
| ODIUM - ODRAZA - ODROERIR - ODYSSEA |
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OF
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| OF FEATHER AND BONE - OF MICE & MEN - The OFFERING - OFFICIUM TRISTE - The OFFSPRING |
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OJ
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| OJM |
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OL
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| The OLD DEAD TREE - OLD MAN GLOOM - OLD MAN'S CHILD - OLD NICK - OLD SILVER KEY |
| OLHAVA - OLIO TÄHTIEN TAKANA - OLIVA - OLIVER / DAWSON SAXON - OLIVER WEERS |
| OLYMPOS MONS |
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OM
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| OM - OMEGA INFINITY - OMEGA LITHIUM - OMEGA MASSIF - OMEGAVORTEX |
| OMEN - OMMATIDIA - OMNIUM GATHERUM |
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ON
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| ON THORNS I LAY - ONDSKAPT - The ONE - ONE MAN ARMY - ONEYED JACK |
| ONSLAUGHT - ONWARD |
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OO
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| OOH LA LA - OOMPH! |
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OP
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| OPERA IX - OPERA MAGNA - OPERADYSE - OPERATION: MINDCRIME - OPETH |
| OPHIDIAN I - OPHIOLATRY - OPHIS - OPIUM DU PEUPLE - OPPOSING MOTION |
| OPUS ATLANTICA |
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OR
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| ORAKLE - ORANGE GOBLIN - ORANSSI PAZUZU - ORATORY - ORBIS |
| ORBIT CULTURE - ORCHID - ORCHID [USA] - ORCHIDECTOMY - ORDEN OGAN |
| ORDER OF ELEPHANTS - The ORDER OF ISRAFEL - ORDER OF NINE - ORDER OF NOSFERAT - The ORDER |
| The ORDHER - ORDO FUNEBRIS - The ORGANIZATION - ORGONE - ORIGIN |
| ORIGINAL SIN - ORION RIDERS - ORION'S REIGN - ORKHYS - ORKRIST |
| ORNAMENTOS DEL MIEDO - OROMET - ORPHALIS - ORPHANAGE - ORPHANED LAND |
| ORPHANED LAND / AMASEFFER - ORPHEUS BLADE - ORPHEUS OMEGA - ORTHODOX |
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OS
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| OS CROIX - Ozzy OSBOURNE - OSI - OSIRION - OSTURA |
| OSYRON |
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OT
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| OTARGOS - OTEP - The OTHER - OTYG |
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OU
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| OUBLIETTE - OUROBOROS - OUT BODY EXPERIENCE - The OUTBURST - OUTCAST |
| OUTLAW BLOOD - The OUTPATIENCE - OUTRE - The OUTSIGHT - OUTWORLD |
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OV
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| OV HELL - OVER THE EDGE - OVERDOSE - OVERDRIVERS - OVERKILL |
| OVERLOADED - OVERWIND |
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OX
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OXIPLEGATZ
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