O'Funk'illo
funk, funk metal, funk rock, rock
O-Zone
dance, eurodance, europop, pop
O.R.O.
dance, eurodance, pop rock, rock
O.T. Quartet
dance, electro, electronic
O.V. Wright
deep soul, rhythm and blues, soul, southern soul
Oak Pantheon
black metal, folk metal, post-metal
Obscura
death metal, progressive death metal, progressive metal, technical death metal
Ocean Colour Scene
britpop, indie rock, rock
Oceana
emocore, metalcore, post-hardcore, screamo
Oceanlab
dance, electronic, progressive trance, trance
Oceans Ate Alaska
emocore, metal, metalcore, post-hardcore
Oceansize
alternative rock, post-rock, progressive rock
Ochre
ambient, electronic, electronica, idm
Octave One
detroit techno, electronic, house, techno
Octavia Sperati
doom metal, gothic metal, metal
October Project
progressive rock, rock, folk
Odd Crew
groove metal, metal, sludge metal
Odem
black metal, blackened death metal, death metal
