Onslaught
heavy metal, metal, speed metal, thrash metal
Onyx
gangsta rap, hip hop, rap
Onyx Eyes
gothic metal, symphonic metal
Onze:20
pop rock, reggae, rock
Ooah
dubstep, electronic, glitch
Ooberman
britpop, indie pop
Ooklah the Moc
dub, reggae, roots reggae
Oomph!
industrial metal, metal, rock
oOoOO
chillwave, darkwave, electronic, witch house
Oorutaichi
avant-garde, electronic, house
Opal
dream pop, paisley underground
Opća Opasnost
hard rock, heavy metal, rock
Open Air Stereo
alternative rock, rock
Open Chapter
alternative rock, hard rock, rock
Open Hand
alternative rock, emo, rock
Opera Chaotique
alternative rock, cabaret, gothic metal
Opera IX
black metal, gothic metal, metal, symphonic black metal
Operadyse
power metal, symphonic metal
Operatic
alternative rock, emo
Operatika
gothic metal, metal, power metal, symphonic metal
Operation Ivy
punk rock, ska, ska punk
Operator
alternative metal, grunge, hard rock, post-grunge, rock
Opeth
death metal, metal, progressive death metal, progressive metal
Ophélie Winter
french pop, pop
Ophicvs
black metal, heavy metal, speed metal
Ophidian
darkcore, gabber, hardcore techno
Ophis
death metal, doom metal
Ophthalamia
black metal, doom metal, melodic black metal
Ophydian
alternative metal, heavy metal, melodic metalcore
Opiate For The Masses
alternative metal, industrial metal, metal, rock
OPIUO
breakbeat, dubstep, glitch
Opolopo
broken beat, electronic, funk, nu jazz, soul
Oppenheimer MKII
new wave, synthpop
Opposition
new wave, post-punk
