One-T + Cool-T
dance, hip hop, pop, rap
Onelinedrawing
emo, singer-songwriter
OneRepublic
alternative rock, pop rock, rock
OneSideZero
alternative metal, alternative rock, hard rock, nu metal, rock
OneWorld
dance, electronic, electronica, progressive trance, trance
Onie Wheeler
country, rock and roll, rockabilly
Oniric
cabaret, dark cabaret, neofolk
Only Crime
hardcore punk, melodic hardcore, punk rock
Only Living Witness
hard rock, metal, metalcore, stoner rock
onoken
electronic, trance
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
