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OBED MARSH

OBITUARY

OBLITERATION

OBSCURA

OBSCURE BURIAL

OBSCURE INFINITY

OBSCENITY

OBSEQUIAE

OBSESSION

OBSIDIAN

OBSIDIAN KINGDOM

OBTRUNCATION

OCEAN CHIEF

OCEAN MIND

OCEANSIZE

OCEANS OF SLUMBER

O CERCO

OCTOBER FALLS

OCTOBER TIDE

ODIOUS

ODRAZA

OESTRE

OFFICIUM TRISTE

OGARYA

OGDRU JAHAD

OGEN

OLD MAN'S CHILD

OLD SILVER KEY

OLIVA

OLIVER WEERS

OLYMPOS MONS

PAT O'MAY

OMEGA LITHIUM

OM MANI

OMMATIDIA

OMNIUM GATHERUM

OMNIVORE

OMNIZIDE

ONE I CINEMA

ONE MACHINE

ONE MAN ARMY AND THE UNDEAD QUARTET

ONE WAY MIRROR

ONE WITHOUT

ONIRIK

ONIRIK ILLUSION

ONIRISM

ONSLAUGHT

ON THE RISE

OOMPH!

OPERA DIABOLICUS

OPERA IX

OPERATION:MINDCRIME

OPETH

OPHIDIAN SPELL

OPIUM WARLORDS

ORACULUM

ORAKLE

ORANGE GOBLIN

ORANSSI PAZUZU

ORCULTUS

ÖRÖK

ORDEN OGAN

ORDEM SATÂNICA

ORDER OF ORIAS

ORDINANCE

ORIENT EXPRESS

ORIGAMI GEIJUTSU

ORIGIN

ORIGIN' HELL

ORPHANED LAND

ORPHANED LAND & AMASEFFER

OSCULUM INFAME

OSI

OSSUARY INSANE

OSTOTS

OTARGOS

OTEP

OTIUM

OUTLOUD

OUTSHINE

OUTWORLD

OVAKNER

OVERDRIVE

OVERKILL

OVERLOAD

OVERMASTER

TIM "RIPPER" OWENS

OXYMOR

OZ

OZ NOY

OZZY OSBOURNE