OATH OF CRUELTY
OBED MARSH
OBITUARY
OBLITERATION
OBLIVION PROTOCOL
OBSCURA
OBSCURE BURIAL
OBSCURE INFINITY
OBSCENITY
OBSEQUIAE
OBSCURING VEIL
OBSESSION
OBSIDIAN
OBSIDIAN KINGDOM
OBTRUNCATION
OBUEDIAN RAPH
OCEAN CHIEF
OCEAN MIND
OCEANS
OCEANSIZE
OCEAN OF GRIEF
OCEANS OF SLUMBER
O CERCO
OCTOBER FALLS
OCTOBER TIDE
ODDISM
ODDLAND
ODIOUS
ODIOUS MORTEM
ODRAZA
OESTRE
OF FEATHER AND BONE
OFFICIUM TRISTE
OF MICE AND MEN
OGARYA
OGDRU JAHAD
OGEN
OKSENNUS
OLA ENGLUND
OLD MAN'S CHILD
OLD SILVER KEY
OLIVA
OLIVER WEERS
OLYMPOS MONS
OMEGA LITHIUM
OMEGAVORTEX
OMINOUS RESURRECTION
OM MANI
OMMATIDIA
OMNIUM GATHERUM
OMNIVORE
OMNIZIDE
ONCE HUMAN
ONCE UPON A WINTER
ONE I CINEMA
ONE MACHINE
ONE MAN ARMY AND THE UNDEAD QUARTET
ONE TAIL, ONE HEAD
ONE WAY MIRROR
ONE WITHOUT
ONIRIK
ONIRIK ILLUSION
ONIRISM
ONSLAUGHT
ON THE RISE
ON THORNS I LAY
OOMPH!
OPERA DIABOLICUS
OPERA IX
OPERATION:MINDCRIME
OPETH
OPHIDIAN SPELL
OPIUM WARLORDS
OPPROBRIUM
ORACULUM
ORAKLE
ORANGE GOBLIN
ORANSSI PAZUZU
ORBIT CULTURE
ORCULTUS
ÖRÖK
ORDEATHRAL
ORDEN OGAN
ORDEM SATÂNICA
ORDER OF ORIAS
ORDINANCE
ORDO CULTUM SERPENTIS
ORIENT EXPRESS
ORIGAMI GEIJUTSU
ORIGIN
ORIGIN'HELL
ÔROS KAÙ
ORPHANED LAND
ORPHANED LAND & AMASEFFER
ORTHODOXY
OSCULUM INFAME
OSI
OSI AND THE JUPITER
OSSUARY INSANE
OSTOTS
OSYRON
OTARGOS
OTEP
OTIUM
OUR OCEANS
OUTLAWS
OUTLOUD
OUTSHINE
OUTWORLD
OVAKNER
OVERDRIVE
OVERKILL
OVERLOAD
OVERMASTER
OV SULFUR
TIM 'RIPPER' OWENS
OXYMOR
OZ
OZ NOY
OZZY OSBOURNE
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