OAKENSHIELD
OAKHELM
the OATH
OATHBREAKER
OATHEAN
OBEY THE BRAVE
OBITUARY
OBLIVEON
OBLOMOV
OBNOXIOUS
OBRERO
OBSCENE EULOGY
OBSCURA
OBSCURCIS ROMANCIA
an OBSCURE SIGNAL
OBSCURITY
the OBSESSED
OBSIDIAN GATE
OBSIDIAN SHELL
OBSKURE TORTURE
OBTAINED ENSLAVEMENT
OBTEST
OBÚS
OCCULT
the OCEAN
OCEANO
OCEANS OF SADNESS
OCTAVIA SPERATI
OCTINOMOS
OCTOBER 31
OCTOBER FALLS
OCTOBER TIDE
ODD CREW
ODDLAND
ODD PROJECT
ODES OF ECSTASY
ODIO SU TELA
ODIOUS
ODIOUS MORTEM
ODIOUS SANCTION
ODIUM
ODIUM (CANADA)
ODROERIR
ODYSSEA
OFÄRD
OFERMOD
OFFERTORIUM
OFFICIUM TRISTE
the OFFSPRING
OF GRAVES AND GODS
OF INFINITY
OF MICE & MEN
:OF THE WAND AND THE MOON:
OF VIRTUE
OHGR
OH, SLEEPER
O'KINGDOM
OKULAR
OLD
the OLD DEAD TREE
OLD FOREST
OLD FUNERAL
OLD MAN GLOOM
OLD MAN'S CHILD
OLD SEASON
OLIVER MAGNUM
OLYMPOS MONS
OM
OMARI
the OMEGA EXPERIMENT
OMEGA LITHIUM
OMEN
OMINOUS GRIEF
OMNICIDE
OMNIUM GATHERUM
ON BROKEN WINGS
ONCE DEAD
ONDSKAPT
ONE DEAD THREE WOUNDED
ONE KING DOWN
ONE MAN ARMY AND THE UNDEAD QUARTET
ONE MINUTE SILENCE
ONE MORE VICTIM
ONE MORNING LEFT
ONE SENSE TOO MUCH
ONESIDEZERO
ONE WITHOUT
ONE YEAR LATER
ONLY LIVING WITNESS
ONMYOUZA