Subgenres

Metal  artists

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