Olivier Libaux
bossa nova, jazz, singer-songwriter
Olympic Ayres
dance, electropop, indie pop, synthpop
Omar
acid jazz, funk, neo soul, soul
Omar & The Howlers
blues, classic rock, rock, southern rock
OMD
alternative rock, electronic, new wave, synthpop
Omega
classic rock, hard rock, progressive rock, rock
Omen
heavy metal, metal, power metal
OMFO
electronic, electronica, folk
Omi
dance, electronic, reggae
Omni Trio
drum and bass, electronic, jungle
Omnitica
dubstep, electro house, electronic
on
ambient, hardcore punk, straight edge
On The Last Day
emocore, post-hardcore, screamo
One Buck Short
pop, pop punk, punk rock, rock
