Subgenres

Metal  artists

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O'Brother
OAK
Oakenshield
Oath of a Traitor
Oathbreaker
Obelyskkh
Obey The Brave
Obiat
Obituary
Oblique Rain
Obliteration
Oblivion Protocol
Obscura
Obscure Infinity
Obscurity
Obsequiae
Obvurt
Ocean Grove
Ocean of Grief
Oceana
Oceano
Oceans
Oceans Ate Alaska
Oceans of Slumber
Octavia Sperati
October Falls
October Tide
Ocultan
Odious Mortem
Odium
Odyssea
Of Blood and Wine
Of Mice & Men
Of Modern Architecture
Of Virtue
Ofdrykkja
Off the Cross
Officium Triste
Ogre
Oh, Sleeper
OHHMS
Okera
Okilly Dokilly
Old Funeral
Old Gods of Asgard
Old Man Gloom
Old Man's Child
Oldfodt
Oliva
Olympos Mons
Om
Omega Infinity
Omega Lithium
Omega Massif
Omen
Ominum
Omnia
Omnihility
Omnium Gatherum
Omnizide
Omotai
On a Pale Horse
On Thorns I Lay
Once Human
Ondfodt
Ondskapt
One Minute Silence
One Without
One-Way Mirror
Oni
Onkel Tom Angelripper
Onlap
Only Child
Only Living Witness
Onslaught
Onward
Onyx Key
Oomph!
Oozing Wound
Opera Diabolicus
Opera IX
Operation: Mindcrime
Operus
Opeth
Ophidian I
Ophiocordyceps
Opium Warlords
Opprobrium
Orange Goblin
Oranssi Pazuzu
Orbit Culture
Orchid
Orcustus
Orden Ogan
Order of Ennead
Ordog
Organectomy
Orgy
Orient Fall
Origin
Orion's Reign
Orne
Orphalis
Orphaned Land
Orphaned Land & Amaseffer
Orphans of Dusk
Orth
Osada Vida
OSI
Osiah
Ossuarium
Ostrogoth
Ostura
Otargos
Otep
Otherwise
OU
Our Hollow, Our Home
Our Last Night
Our Promise
Our Subatomic Earth
Ouroboros
Outcast
Outer Heaven
Outlaw
Outlaw Blood
Outline
Outrage
Outre-Tombe
Outrun the Sunlight
Outshine
Outworld
Ov Sulfur
Overdose
Overdream
Overdrive
Overkill
Oz
Ozzy Osbourne
The Oath
The Obsessed
The Ocean
The Offering
The One Hundred
The Ongoing Concept
The Order of Elijah
The Organization
The Otolith
The Overseer