:OF THE WAND AND THE MOON:
O'BROTHER
O'KINGDOM
O.N.A.
OAK PANTHEON
OAKENSHIELD
OAKHELM
OAR
the OATH
OATHBREAKER
OATHEAN
OBERRIS
OBEY THE BRAVE
OBITUARY
OBLITERATE
OBLITERATIONS
OBLIVEON
OBLIVION
OBLIVION THRONE
OBLIVIONIZED
OBLOMOV
OBNOXIOUS
OBRERO
OBSCENE EULOGY
OBSCURA
OBSCURA QALMA
OBSCURCIS ROMANCIA
an OBSCURE SIGNAL
OBSCURITY
OBSEQUIAE
the OBSESSED
OBSIDIAN GATE
OBSIDIAN KINGDOM
OBSIDIAN SHELL
OBSIDIAN TIDE
OBSKURE TORTURE
OBSOLETE THEORY
OBTAINED ENSLAVEMENT
OBTEST
OBVURT
OBÚS
OCCULT
the OCEAN
an OCEAN BETWEEN US
OCEANA
OCEANO
OCEANS ATE ALASKA
OCEANS OF SADNESS
OCEANS RED
OCTAVIA SPERATI
OCTINOMOS
OCTOBER 31
OCTOBER FALLS
OCTOBER TIDE
OCTOPUS LILIUM
ODD CREW
ODD PROJECT
ODDLAND
ODES OF ECSTASY
ODIN'S COURT
ODIO SU TELA
ODIOUS
ODIOUS MORTEM
ODIOUS SANCTION
ODIUM
ODIUM (CANADA)
ODIØ
ODROERIR
ODYSSEA
OF DIVINITY
OF GLACIERS
OF GRAVES AND GODS
OF INFINITY
OF MAN AND MACHINE
OF MICE & MEN
OF VIRTUE
OFERMOD
OFFERTORIUM
OFFICIUM TRISTE
the OFFSPRING
OFÄRD
OGARYA
OGRATH
OGRE
OH, SLEEPER
OHGR
OKSANAT
OKULAR
OLD
the OLD DEAD TREE
OLD FOREST
OLD FUNERAL
OLD MAN GLOOM
OLD MAN'S CHILD
OLD NIGHT
OLD SEASON
OLD WOUNDS
OLIVER MAGNUM
OLYMPOS MONS
OM
OMARI
OMEGA CENTAURI
the OMEGA EXPERIMENT
OMEGA LITHIUM
the OMEGA MAN
OMEN
OMINOUS GRIEF
OMINOUS RUIN
OMNIA
OMNICIDE
OMNISPAWN
OMNIUM GATHERUM
ON BROKEN WINGS
ON SOLID GROUND
ON THORNS I LAY
ONCE DEAD
ONCE FORGOTTEN
ONCE HUMAN
ONDSKAPT
ONE DEAD THREE WOUNDED
ONE KING DOWN
ONE LAST LOOK
ONE MAN ARMY AND THE UNDEAD QUARTET