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OBSCURE VORTEX
OBSCURITY
OBSESSION
OBUS
ODIN
ODROERIR
ODYSSEA
OLD MAN'S CHILD
OLYMPOS MONS
OMEN
OMNIUM GATHERUM
ONSLAUGHT
OOMPH!
OPERATIKA
OPETH
ORACLE
ORATORY
ORDEN OGAN
ORDO DRACONIS
ORION'S REIGN
ORKRIST
ORPHANED LAND
OSCURITY
OSTROGOTH
OTYG
OVERDRIVE
OVERKILL
OVERLOAD
OVERLORDE
OVERMASTER
OZ
OZZY OSBOURNE