- O
- O Rappa
- O-Town
- O-Zone
- O.A.R . (Of A Revolution)
- O.A.R. (OF A REVOLUTION)
- O.M.D
- O.M.D.
- Oak Ridge Boys
- Oakey Philip And Moroder Giorgio
- Oakley Pike
- Oar
- Oasis
- Obie Trice
- Obispo Pascal
- Obituary
- Obk
- Obliveon
- Obscure Disorder
- Obsession Indecent
- Obsidian Gate
- Obtained Enslavement
- Obtest
- OC
- Ocean Blue
- Ocean Colour Scene
- Oceans Of Sadness
- Ochs Phil
- Octavia
- October 31
- October Project
- Odds
- Odes Of Ecstasy
- Odetta
- Odious
- Odious Sanction
- Odyssey
- Of The Wand And The Moon
- Off Broadway
- Off By One
- Off Topic
- Office of Strategic Influence (O.S.I.)
- Offspring
- Ofra Haza
- Ogie Alcasid
- Ohgr
- Ohio Express
- Oil Midnight
- Oingo Boingo
- OK Go
- Oklahoma! Soundtrack
- Ol Dirty Bastard
- Ol Dirty Bastard f Raekwon the Chef Method Man
- Ol Skool
- Ola & Potatisarna
- Old
- Old 97s
- Old Lady Drivers
- Old Man Gloom
- Old Mans Child
- Old Songs, Lullabies, Shanties etc.
- Oldfield Mike
- Oldfield Sally
- Oleander
- Olga Tanon
- Olga Taon
- Olive
- Oliver
- Oliver Dragojevic
- Oliver! Soundtrack
- Olivia
- Olivia Newton
- Olivia Newton John
- Olivia Newton-John
- Olomana
- Olsen Brothers
- Olsen Twins
- Oman Freestyle
- Omd
- Ome Henk
- Omen
- Omen Hungary
- Omnium Gatherum
- Omul Cu Sobolani
- On Broken Wings
- On Thorns I Lay
- Once Blue
- Onda Vaselina
- Onda Vaselina, La
- One 2 Many
- One Day Fly
- One Dollar Short
- One KRS
- One Man Army
- One Minute Silence
- One More Day
- One More Time
- One Piece
- ONE RING musical
- One Side Zero
- One Voice
- One-21
- Onesidezero
- Onesto Jennifer
- Onkel Kankel
- Onkelz Boehse
- Onslaught
- Onward
- Onyx
- Onyx f Lost Boyz
- Oobie
- Ookla The Mok
- Oomph
- Oora
- Opcion Sonica
- Opera IX
- Operation Ivy
- Opeth
- Ophthalamia
- Opm
- Oppressor
- Opprobrium aka Incubus
- Option 1
- Opuestos Sentidos
- Opus
- Opus Iii
- Orange 9mm
- Orange Blue
- Orange Goblin
- Orange Juice
- Orange Range
- Oratory
- Orbison Roy
- Orbit
- Orbital
- Orchestral Manoeuvres In The Dark
- Order New
- Ordo Equilibrio
- Oreiro Natalia
- Oreja De Van Gogh, La
- Orff Carl
- Organic Critters
- Organic Revolution Orchestra
- Organized Konfusion
- Orgy
- Origin
- Original Broadway Cast
- Original Cast
- Original Naabtal Duo
- Originoo Gunn Clapazz
- Orishas
- Orkest Klein
- Orlando
- Orlando Tony
- Orlons
- Oro
- Orphanage
- Orphaned Land
- Orrico Stacie
- Orton Beth
- Os Hip?critas
- Os Mutantes
- Os Paralamas Do Sucesso
- OS101
- Osbourne Ozzy
- Oscar Medina
- Osdorp Posse
- Osker
- Osmond Brothers
- Osmond Donny
- Osmond Marie
- Ossian
- Ostbahn-Kurti Und Die Chefpartie
- Osullivan Raymond
- Otep
- Otis
- OTIS REDDING
- Ott
- Otyg
- Our Lady Peace
- Ours
- Out Of Eden
- Out Of Season
- Out of the Grey
- Outcast
- Outfield
- OUTKAST
- Outlandish
- Outlaw Star
- Outlawz
- Outsiders
- Ov7
- Over The Rhine
- Overbass
- Overcast
- Overdrive Bachman-Turner
- Overkill
- Overstreet Paul
- Overtones Rustic
- Owen Mark
- Owens Buck
- Owens Ginny
- Oxide & Neutrino
- Oxiplegatz
- Oxymoron
- Oystein Sunde
- Oyster Band
- Oz M?go De
- Ozark Mountain Daredevils
- Ozma
- Ozomatli
- Ozzie Nelson
- Ozzy Osbourne