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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