- O Brother Where Art Thou?
- O Jackie
- O M D
- O Rappa
- O Surto
- O'Jays
- O'Ryan
- O-Town
- O-v-s-a
- O-Zone
- O.A.R.
- O.A.R. (Of A Revolution)
- O.C.
- O.G. Spanish Fly
- O.G. Style
- O.G.C. (Originoo Gunn Clappaz)
- O.L.D.
- O.R.O. (Onde Radio Ovest)
- Oag
- Oai Star
- Oak Ridge Boys
- Oak Ridge Boys, The
- Oakey Philip And Moroder Giorgio
- Oar
- Oasis
- Oathean
- Oatmeal Dog
- Obadiah Parker
- Obala Daleka
- Obie Bermúdez
- Obie Trice
- Obispo Pascal
- Obituary
- Objek Bulat
- OBK
- Obliveon
- Oblivion
- Oblivion Dust
- Obrien Richard
- Obrint Pas
- Obscene Eulogy
- Obscurcis Romancia
- Obsessed (the)
- Obsession Indecent
- Obsidian Gate
- Obtained Enslavement
- Obtest
- Oc Supertones
- Ocasek Ric
- Occipitool
- Occult
- Ocean
- Ocean 11
- Ocean Blue
- Ocean Colour Scence
- Ocean Colour Scene
- Ocean Eleven
- Ocean Hero
- Oceana
- Oceania
- Oceanlab
- Oceano
- Oceans Of Sadness
- Oceansize
- Ochs Phil
- Oconnor Hazel
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- Octagon Dr.
- Octavia
- Octinomos
- October 31
- October Crisis
- October Fall
- October Falls
- October Project
- October Tide
- Odd And Idle
- Odd Man Out
- Odd Nordstoga
- Odd Project
- Odd Squad
- Odds
- Oddzial Zamkniety
- Odes Of Ecstasy
- Odetta
- Odette Quesada
- Odio A Botero
- Odious
- Odious Sanction
- Odium
- Odorants
- Odyssey
- Of A Revolution
- Of Montreal
- Of Sound And Fury
- Of The Son
- Of The Wand And The Moon
- Ofermod
- Off Broadway
- Off By One
- Off Minor
- Off Topic
- Off We Go Again
- Offbeatz
- Offenbach
- Offertorium
- Office of Strategic Influence (O.S.I.)
- Officer Negative
- Official Kardinal
- Officinalchemike
- Officium Triste
- Offlaga Disco Pax
- Offset
- Offspring
- Oficina G3
- Ofra Haza
- Often Sick
- Ogie Alcasid
- Ogre You Asshole
- Ogres De Barback
- Ogres De Barback (Les)
- Oh Laura
- Oh No
- Oh No Ono
- Oh No! Oh My!
- Oh, Juliet!
- Oh, Sleeper
- Oh, The Story!
- Ohgr
- Ohio Players
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- Oi Polloi
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- Oi Va Voi
- Oil
- Oingo Boingo
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- OJ Da Juiceman
- Ojos De Brujo
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- OK Go
- Okay
- Okaysions
- Okeefe Danny
- Okkervil River
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- Oktoberklub
- Okuda Miwako
- Ol' Dirty Bastard
- Ola Magnell
- Olaf Henning
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- Old
- OLD (O.L.D.)
- Old 97's
- Old Canes
- Old Crow Medicine Show
- Old Dead Tree
- Old Funeral
- Old Grandad
- Old Man Gloom
- Old Man River
- Old Man Shattered
- Old Man's Child
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- Old Town Mafia
- Oldelaf Et Monsieur D
- Oldfield Michael
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- Ole Ivars
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- Olive
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- Oliver Onions
- Olivia
- Olivia Broadfield
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- Olivia Newton-John
- Olivia Olson
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- Olivija
- Olli
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- Olli Schulz And Der Hund Marie
- Olli Schulz Und Der Hund Marie
- Olmo
- Olsen Brothers
- Olsen Brothers, The
- Olsen Twins
- Olu Dara
- Olympia
- Olympos Mons
- Oman Freestyle
- Omar
- Omar A. Rodriguez-Lopez
- Omar Chakil
- Omar Esaú
- Omar Faruk Tekkbilek and Richard A. Hagopian
- Omar Pedrini
- Omarion
- Omarion ft. Usher
- Omc
- Omd
- Ome Henk
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- Omen
- Omnia
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- Omp
- Omul Cu Sobolani
- Omul Cu _obolani
- Omw
- On Broken Wings
- On The Last Day
- On The Line All Star
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- On The Surface
- On Thorns I Lay
- Once
- Once Blue
- OnceOver
- Onda Vaselina
- Onda Vaselina, La
- Onda, La
- Ondskapt
- One
- One 2 Many
- One And
- One Bullet Left
- One Chance
- One Day as a Lion
- One Day Fly
- One Dead Three Wounded
- One Dimensional Man
- One Dollar Short
- One Drop
- One Eskimo
- One Fell Swoop
- One Giant Leap
- One Inch Punch
- One King Down
- One KRS
- One Less Reason
- One Man Army
- One Mic
- One Minute Silence
- One More Time
- One Night Only
- One Pedaled Bike
- One Session
- One Side Zero
- One Step Ahead
- One Ton
- One Too Many
- One Track Mind
- One True Thing
- One True Voice
- One Voice
- One Way
- One Way System
- One Way To Rick
- One-21
- One-T
- One.Be.Lo
- Oneders
- Onelinedrawing
- OneRepublic
- OneRepublic & Sara Bareilles
- Ones, The
- Onesidezero
- Onetwo
- Onions Oliver
- Only Crime
- Only Living Witness
- Only Ones
- Only Seven Left
- Onslaught
- Onur Kececigil
- Onward
- Onyx
- Oomph!
- Oona
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- Open Hand
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- Openmindead
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- Opera IX
- Operacion Triunfo
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- Operator
- Operator Please
- Opeth
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- Opio
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- Oppera
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- Oppressed
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- Or Just Not
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- Orchid
- Ord Maren
- Order From Chaos
- Order Of The Ebon Hand
- Order Of The Fly
- Ordinance
- Ordinary Boys
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- Ordo Draconis
- Ordo Equilibrio
- Ordo Rosarius Equilibrio
- Ore Ska Band
- Oreja De Bango
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- Orenda Fink
- Organism 12
- Organized Konfusion
- Orgy
- Orianthi
- Orient Pearl
- Orietta Berti
- Origin
- Original 3
- Original Broadway Cast
- Original Cast
- Original Cast Recording
- Original Flavor
- Original Television Soundtrack
- Original TV Soundtrack
- Originales De San Juan, Los
- Originoo Gunn Clapazz
- Orion
- Orion The Hunter
- Orion Too Feat. Caitlin
- Orishas
- Orkest Klein
- Orlando Tony And Dawn
- Orleans
- Orme Le
- Ornans Floor
- Ornatos Violeta
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- Oro
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- Os Almirantes
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- OS101
- Osaka Popstar
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- Oscar Brand
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- Oscar G
- Oscar Hammerstein
- Oscar Lopez
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- Osker
- Oslo Gospel Choir
- Osmond Brothers
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- Ossian
- OST
- OST Cry Baby
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- Ostara
- Ostbahn Kurt
- Ostbahn-Kurti Und Die Chefpartie
- Ostkyst Hustlers
- Osullivan Gilbert
- Osunlade
- Osvajaci
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- Otep
- Othello
- Otierre
- Otis Redding
- Otis Rush
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- Otis Taylor
- Otium
- Ott
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- Ottmar Liebert
- Otto Ohm
- Otto Waalkes
- Ottodix
- Otx
- Otyg
- Ounce Of Self
- Our Lady Peace
- Our Last Night
- Ours
- Out Hud
- Out Of Eden
- Out Of My Hair
- Out Of Order
- Out Of Season
- Out of the Grey
- Out Of Your Mouth
- Outbreak
- Outer Limits
- Outerspace
- Outfield
- Outhere Brothers
- Outkast
- Outkast F Raekwon The Chef
- Outlandish
- Outlaw Star
- Outlaws
- Outlawz
- Outlier
- Outsidaz
- Outsiders
- Outsmarting Simon
- Outspoken
- OV7
- Oval Opus
- Over It
- Over The Rhine
- Overbass
- Overcast
- Overcome
- Overdose
- Overdrive Bachman-Turner
- Overflow
- Overglow
- Overground
- Overhead
- Overkill
- Overkill Urge
- Overlead
- Overlife
- Overlorde
- Overmars
- Overnight Jones
- Overseer
- Oversoul
- Overstreet Paul
- Overthrow
- Overtone
- Overtones Rustic
- Owen
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- Oxa
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- Oxide & Neutrino
- Oxide And Neutrino
- Oxiplegatz
- Oxo
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- Oxymoron
- Oystein Sunde
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- Oysters
- Ozaki Yutaka
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- Ozark Mountain Daredevils
- Ozielzinho
- Ozma
- Ozomatli
- Ozric Tentacles
- Ozzy Osbourne
- Ozzy's Angels
