Subgenres

Metal  artists

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