Obsidian Kingdom : Meat Machine

Avantgardiste Black

Obsidious : Iconic (Single)

Technical Death

Obsidious : Sense of Lust

Technical Death

Obsidious : Under Black Skies

Technical Death

Obsidious : Bound by Fire

Technical Death

Obsidious : Iconic

Technical Death

Obszön Geschöpf : Highway of Horrors

Industrial Metal

Oceans Of Slumber : Where Gods Fear to Speak (Single)

Progressive Death

Oceans Of Slumber : Poem of Fire

Progressive Death

Oceans Of Slumber : Where Gods Fear to Speak

Progressive Death

Oceans Of Slumber : Alone

Progressive Death

Octavia Sperati : Grace Submerged

Gothic Doom

Of Legends : Stranded

Hardcore

Ofö Am : Ofö Am

Stoner

Omega Infinity : Solar Spectre

Black Metal

Omega Infinity : The Anticurrent

Black Metal

Ommatidia : In This Life, or the Next

Dark Metal

Omophagia : In the Name of Chaos

Death Metal

On Thorns I Lay : On Thorns I Lay

Gothic Doom

Onesta : Back to Reality

Hardcore