Ohm Guru
chillout, downtempo, electronic, electronica
Ohm Square
drum and bass, electronic
Oho
chillout, electronica, progressive rock, trip-hop
Oi Va Voi
chillout, electronic, trip-hop
Ojo Rojo
metal, stoner metal, stoner rock
OK Band
electronic, new wave, synthpop
Ol' Dirty Bastard
gangsta rap, hip hop, rap
Ola & The Janglers
classic rock, oldies, pop
Ola Belle Reed
americana, bluegrass, country, folk
Ola Magnell
progressive rock, singer-songwriter
Ola Podrida
indie folk, singer-songwriter, folk
Olam Ein Sof
ambient, folk metal, neofolk, folk
Olavi Uusivirta
pop, rock, singer-songwriter
