Bands

No Stone

Argentina · Psychedelic Stoner/Doom Metal

November Fire

United States · Psychedelic Doom/Stoner Metal

Nvlvs

Denmark · Black/Death Metal

Obey the Moon

Mexico · Melodic Death Metal

Obligatory Fiend

New Zealand · Deathcore

Obnounce

Slovenia · Black/Death Metal

Obscure Infinity

Germany · Death Metal (early); Melodic Death Metal (later)

Obsidian Tide

Israel · Sludge / Post / Progressive

Ocean Districts

Estonia · Post-Metal

Old Moon

United States · Melodic Black Metal

Once Awake

Norway · Groove Metal/Metalcore

Orbis de Ignis

Finland · Gothic/Doom Metal

Organ Dealer

United States · Grindcore

Orlag

France · Black/Death Metal

Orob

France · Black

Orphean

Italy · Melodic Death Metal

Ossuary Wraith

United States · Black Metal

Otargos

France · Black Metal

Our Daily Trespasses

United States · Symphonic/Atmospheric Black/Death Metal

Outnumber the Living

United States · Melodic Death Metal

ØVI

United States · Death/Black Metal

Ozawar

Canada · Death/Thrash Metal

O Zorn!

United States · Doom Metal/Rock

Pafund

Denmark · Depressive Black Metal/Dark Ambient (early); Dungeon Synth (later)