O

Opera IX

Omega Infinity

October File

Obscure NWOBHM Releases

Overdrive

Omnium Gatherum

Orden Ogan

Odd Dimension

Obsession

Olympos Mons

Old Forest

Orcrypt

Ossuary

OZ

Oranssi Pazuzu

Once Human

Osmose Productions

Oceans

Oak

Odious Mortem

Ominous Ruin

Ominous Scriptures

Onlap

Obsequiae

Outergods

Opia

Obtained Enslavement

Oro

Onslaught

Obscura

Old Man’s Child

Opeth

Origin

Otep

Overkill

Ozzy Osbourne

Of Mice And Men

Orange Goblin

The Ocean

Omnihility

Ovids Withering

Ondskapt

Obituary

The Ominous Circle

Obsessed, The

Oceans Of Slumber

Orphaned Land

Orchid

Ominous Circle, The

Orkan

Orpheus Omega

Overtorture

Obscenity

Order Of Chaos, The

Organic Infest

Oppressor