Subgenres

Metal  artists

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Ozzy Osbourne
Orgy
Opeth
Odz Manouk
Our Mirage
Ofermod
Of Mice & Men
The Ossuary
Operation: Mindcrime
Oblivion Protocol
OSI
Orbit Culture
Overkill
Orden Ogan
Omnium Gatherum
Ophthalamia
Ofdrykkja
Otherwise
Ondfodt
Orange Goblin
Otep
Oceana
Obituary
The Ocean
One of Nine
Our Last Night
Om
Oathbreaker
Orphaned Land
Of Blood and Wine
Our Promise
Oceans of Slumber
Oomph!
Orchid
Oceans
The Obsessed
Opera Diabolicus
Oak
Obscura
Omnia
The Oath
Operus
Oh, Sleeper
Oceans Ate Alaska
Oliva
The One Hundred
Once Human
Onslaught
The Offering
Outshine
Obiat
Our Hollow, Our Home
Old Gods of Asgard
Oranssi Pazuzu
Ossuarium
Orion's Reign
Omen
Onlap
Outworld
October Falls
Old Man's Child
Ocean of Grief
Ominum
Obliteration
Outrun the Sunlight
One-Way Mirror
Orphaned Land & Amaseffer
Outlaw Blood
Of Virtue
Obvurt
Of Modern Architecture
Onward
Obscure Infinity
O'Brother
One Minute Silence
Osada Vida
Overdrive
Origin
Ogre
The Overseer
Omega Infinity
Ocean Grove
Outrage
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
Opium Warlords
Obey The Brave
Odium
On Thorns I Lay
Orphans of Dusk
The Order of Elijah
Ov Sulfur
Ophiocordyceps
Osiah
Onkel Tom Angelripper
Outre-Tombe
Opprobrium
The Otolith
Olympos Mons
Omega Massif
Octavia Sperati
Only Child
Otargos
Omnizide
Ostrogoth
Obelyskkh
OHHMS
Oakenshield
The Organization
Orne
Ophidian I
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