Artists List: O
- O-Town
- Our Lady Peace
- Omara Portuondo
- Orbital
- O.A.R.
- Ol' Dirty Bastard
- Olivia Newton-John
- OneRepublic
- Otis Redding
- Ozzy Osbourne
- One Twelve
- OK Go
- OutKast
- Oasis
- Off Cause
- Oliver
- Olivia
- Odiame
- Os Mutantes
- Off By One
- Old Navy Players
- Otis Grand
- Outline
- Option 1
- Oi Polloi
- One More Time
- Osibisa
- Originoo Gunn Clapazz
- Open Hand
- One Voice
- Odious Sanction
- Orange 9mm
- Oceans Upon Us
- Orchid
- Old Man Gloom
- Office of Strategic Influence (O.S.I.)
- Original Motion Picture Soundtrack
- OMW
- October Crisis
- October 31
- Original Naabtal Duo
- Orange Range
- Ozark Henry
- Osdorp Posse
- Off Minor
- Of The Pillar
- Ost
- Obie Bermudez
- Oyster Prairie
- Osvajaci
- Olivia Broadfield
- On Broken Wings
- Origin
- Orlando
- Oceans Of Sadness
- Odd Project
- Odds
- Our Last Night
- Operation Ivy
- Otyg
- Outcast Youth
- Osmonds
- O.V. Wright
- Overstreet Paul
- Ocean
- Ott
- Omen
- Olivia Ong
- Olivia Olson
- Old Mans Child
- Obsidian Gate
- Obk
- Ordinary Boys
- O'Ryan
- Once Blue
- Ookla The Mok
- Omnium Gatherum
- One Minute Silence
- Omar A. Rodriguez-Lopez
- Obliveon
- Old Dead Tree
- Officer Negative
- Oak Ridge Boys
- Oh Susanna
- of The Wand And The Moon
- Overseer
- One Day as a Lion
- Orup
- Outbreak
- Olimax
- Overflow
- On Thorns I Lay
- Outlawz
- Original Broadway Cast
- Our Heart's Hero
- Onda Vaselina
- Otto Waalkes
- Ogie Alcasid
- Obtest
- O'2l
- One Way System
- Omen Hungary
- Orlando Brown
- Old Lady Drivers
- Osmond Donny
- Oxide & Neutrino
- Ochs Phil
- Of Sound And Fury
- Only Crime
- Ove Stoylen
- Osullivan Gilbert
- Offset
- Offenbach
- Orbison Roy
- Os Paralamas Do Sucesso
- Opus Iii
- Old & In the Way
- Olaf Henning
- Ossian
- Of The Son
- Original Off-Broadway Cast Recording
- Odes Of Ecstasy
- Otis Reding
- Oblivion
- Oldfield Sally
- Overground
- Oren Lavie
- Oliver Onions
- Onelinedrawing
- O Rappa
- Opera Ix
- Oldfield Mike
- Orbit
- Oxymoron
- Orange And Lemons
- Out Of The Grey
- Oakenfold
- Oscar De La Hoya
- Oli P.
- Outsiders
- Ocean Blue
- OPM
- Oakey Philip And Moroder Giorgio
- Optimo
- Odious
- OurKast
- Oliver James
- Oathean
- Obtained Enslavement
- OJ Da Juiceman
- Ollabelle
- Osmond Brothers
- One Man Army
- One Dollar Short
- Outhere Brothers
- Oconnor Hazel
- Off Broadway
- One Chance
- One Less Reason
- Opus
- One Vo1ce
- Orient Pearl
- O.l.d.
- Ohio Players
- OV7
- Oblivion Dust
- Owl City
- Orchestral Manoeuvres In The Dark (O.M.D.)
- One Block Radius
- One-21
- Osker
- Out Of Your Mouth
- Opiate For The Masses
- Ottawan
- One Album Wonders
- Obispo Pascal
- One Dead Three Wounded
- OAG
- Outcast
- O-zone
- Oconnor Sinead
- Ocean Colour Scene
- Owsley
- Obie Trice
- Orgy
- Oi Va Voi
- Operator
- Orson
- One Nation Crew
- Ofra Haza
- Outspoken
- Oleander
- Okkervil River
- Overkill
- Olu Dara
- Oingo Boingo
- On the Last Day
- Ola Podrida
- October Fall
- Owen
- One Way
- Otep
- Organized Konfusion
- Ozomatli
- Offspring
- Omarion
- Ours
- Opeth
- Originoo Gunn Clappaz
- Original London Cast Recording
- Ohio Express
- Orphaned Land
- Oleta Adams
- October Project
- O.C.
- O.A.R. (Of a Revolution)
- On
- Outlandish
- Outlaws
- Odyssey
- Old Crow Medicine Show
- Odd Squad
- Out of Eden
- Olivia Ruiz
- O.C. Supertones
- Onyx
- Onesidezero
- OMD
- Oceansize
- Oh No! Oh My!
- Ojos de Brujo
- Oysterhead
- Of Montreal
- Oh Sleeper
- Orange Goblin
- Over the Rhine
- Other Men
- Orleans
- Olive
- Oomph
- Obituary
- Osaka Popstar
- Ozark Mountain Daredevils
- Old 97's
- Ozma
- Orchestral Manoeuvres in the Dark
- Olga Tañón
- Orishas
- Over It
- OhGr
- OMC