Orkrist
black metal, doom metal, folk metal, melodic black metal, symphonic metal
Orla Gartland
indie pop, singer-songwriter
Orleans
classic rock, pop, rock, soft rock
Orleya
bossa nova, chillout, pop
Ornament
ambient, dark ambient, electronic, folktronica, idm
Orne
doom metal, progressive rock
Ornette Coleman
avant-garde, free jazz, jazz
Orodruin
black metal, doom metal, metal
Orphan Project
hard rock, progressive metal, progressive rock
Orphaned Land
death metal, folk metal, oriental metal, progressive death metal, progressive metal
Orquesta del Desierto
desert rock, rock, space rock, stoner rock
Orson
indie pop, indie rock, rock
Örsten
electronica, trip hop, trip-hop
Oryon
dance, electronic, progressive trance, trance
