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Obituary (15)
Of Mice & Men (7)
Old Man´s Child (7)
Omen (11)
One Man Army (4)
Onkel Tom (10)
Onslaught (10)
Oomph!! (16)
Operation Mindcrime (3)
Opeth (15)
Orange Goblin (11)
Orchid (7)
Orden Ogan (9)
Orphaned Land (9)
OSI (4)
Ost+Front (9)
Overkill (27)
Oxenkiller (1)
Ozzy Osbourne (20)