Omega Infinity

Solar Spectre	7
The Anticurrent	5

Omega Massif

Karpatia	8
Geisterstadt	7

Omnerod

The Amensal Rise

7

Omnium Gatherum

New World Shadows	8
Beyond	8
The Burning Cold	8
Origin	8
Stuck Here On Snakes Way	6

Omnivortex

Circulate

7

On Thorns I Lay

Threnos	8
On Thorns I Lay	7

Ondfødt

Oldfodt [EP]	8
Det Österbottniska M​ö​rkret	7

Ondskapt

Dödens Evangelium

7

Onheil

In Black Ashes

7

Onlap

Afterglow [EP]	5
Waves	3

Onslaught

Killing Peace

6

Oomph!

Wahrheit Oder Pflicht	7
Monster	6

Opera Magna

El Ultimo Caballero	6
Heroica	5

Opeth

Blackwater Park	10
Deliverance	10
Damnation	10
Watershed	10
Orchid	9
Morningrise	9
My Arms, Your Hearse	9
Still Life	9
Ghost Reveries	9
Pale Communion	9
Heritage	8
In Cauda Venenum	7

Ophidian I

Desolate

7

Ophis

Withered Shades

7

Orakle

Tourments & Perdition

8

Orange Goblin

Healing Through Fire	7
A Eulogy For The Damned	7

Oranssi Pazuzu

Valonielu	9
Mestarin Kynsi	9
Muukalainen Puhuu	8
Värähtelijä	8
Kosmonument	7

Orbit Culture

Descent

7

Orchid

Through The Devil's Doorway [EP]

7

Orden Ogan

To The End	7
Gunmen	6

Order

Lex Amentiae

7

Orecus

Dreadnought

6

Orgone

Pleroma

7

Origin

Antithesis

7

Origin Of Escape

Shapes

7

Orkrist

Luea

5

Ornamentos Del Miedo

Escapando A Través De La Tierra	7
El Cosmos Me Observa En Silencio	6

Ôros Kaù

Thanatos

7

Orphalis

As The Ashes Settle

6

Orphaned Land

Mabool: The Story Of The Three Sons Of Seven	8
Unsung Prophets & Dead Messiahs	8
The Never Ending Way Of ORwarriOR	7
All Is One	7

Orphean Passage

Apart

6

Osiah

Kairos

6

Ossaert

Offerdier

6

Ossian

Angyalok És Emberek

6

Ossilegium

The Gods Below

7

Ostura

The Room

6

Ou

II: Frailty

6

Oubliette

Eternity Whispers

6

Ouroboros

Glorification Of A Myth	7
Emanations	7

Outer Heaven

Infinite Psychic Depths

6

Outergods

A Kingdom Built Upon The Wreckage Of Heaven

5

Outlaw

Reaching Beyond Assiah

7

Outre

Hollow Earth	7
Ghost Chants	6

Ov Hell

The Underworld Regime

8

Ov Shadows

Heresiarch

7

Overkill

The Years Of Decay	8
Horrorscope	8
The Grinding Wheel	8
Scorched	8
Ironbound	7
The Electric Age	7
White Devil Armory	7
The Wings Of War	6

Owdwyr

Receptor

7

Oxbow

Love's Holiday

7

Oxx

The Primordial Blues

6

Öxxö Xööx

Ÿ

7

Ozzy Osbourne

Blizzard Of Ozz	10
Diary Of A Madman	10
No More Tears	9
Ozzmosis	8
Ordinary Man	7
Patient Number 9	7
Scream	6