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 O Brother, Where Art Thou? Songs: I Am A Man Of Constant Sorrow (Soggy Bottom Boys)
 Des O'Connor Songs: I Pretend · Careless Hands · 1-2-3 O'Leary · Dick-A-Dum-Dum
 Hazel O'Connor Songs: Will You
Sinéad O'ConnorSinéad O'Connor
Songs: Nothing Compares 2 U · Why Don't You Do Right? · Illegal Attacks (with Ian Brown)
 Colby O'Donis Songs: What You Got (feat. Akon) · Just Dance (with Lady GaGa) · Beautiful (with Akon & Kardinal Offishall)
Daniel O'DonnellDaniel O'Donnell
Songs: Danny Boy · Isle Of Innisfree · Crush On You · The Wedding Song
 Erin O'Donnell Songs: No Place So Far
The O'JaysThe O'Jays
Songs: Love Train · Use Ta Be My Girl · For The Love Of Money · Livin' For The Weekend
 The O'Kaysions Songs: Girl Watcher
 Danny O'Keefe Songs: Good Time Charlie's Got The Blues
 Alexander O'Neal Songs: Criticize
Jamie O'NealJamie O'Neal
Songs: There Is No Arizona · Somebody's Hero · Trying To Find Atlantis · Like A Woman · Soldier Comin' Home
 Gilbert O'Sullivan Songs: Alone Again (Naturally) · Nothing Rhymed · Matrimony · Get Down · Clair
 O-Town Songs: All Or Nothing · We Fit Together · These Are The Days · Baby I Would · Liquid Dreams
 O-Zone Songs: Dragostea Din Tei (Haiducii) · Despre Tine
 The Oak Ridge Boys Songs: Elvira · Trying To Love Women · American Made · Come On In · Sail Away
OasisOasis
Noel Gallagher & Liam Gallagher
See also: Beady Eye

Songs: Wonderwall · Don't Look Back In Anger · Stop Crying Your Heart Out · Champagne Supernova · D'you Know What I Mean
 Agnes Obel Songs: Riverside
 Stefan Oberhoff Songs: Merci, Daß Es Dich Gibt
 Pascal Obispo Songs: L'important c'est d'aimer · Tu m'avais dit · Rosa · Millésime · Sa raison d'être (Live Fan)
 Ocean Songs: Put Your Hand In The Hand
 Ocean Colour Scene Songs: The Riverboat Song · The Day We Caught The Train
 Ocean Drive Songs: Without You (Perdue sans toi) (feat. DJ Oriska)
Billy OceanBilly Ocean
Songs: Suddenly · When the Going Gets Tough, the Tough Get Going (The Jewel of the Nile) · Love Really Hurts Without You · Caribbean Queen (No More Love On The Run) · There'll Be Sad Songs (To Make You Cry)
Frank OceanFrank Ocean
Songs: Thinkin Bout You · Sweet Life · Super Rich Kids (feat. Earl Sweatshirt)
 Oceana Songs: Endless Summer · Cry Cry
 Tom Odell Songs: Another Love
 Odyssey Songs: Native New Yorker · Going Back To My Roots
Of Monsters And MenOf Monsters And Men
Songs: Little Talks · King And Lionheart
 Offenbach Songs: Mes blues passent pu dans porte · Chu un rocker · Promenade sur Mars
 Kardinal Offishall Songs: Dangerous (feat. Akon) · Beautiful (with Akon & Colby O'Donis)
The OffspringThe Offspring
Songs: The Kids Aren't Alright (The Faculty) · Original Prankster · Pretty Fly (For a White Guy) · You're Gonna Go Far, Kid · Hit That
 Ofra Haza Songs: Im Nin'Alu
 Ohio Express Songs: Yummy Yummy Yummy
 The Ohio Players Songs: Love Rollercoaster · Fire
Oingo BoingoOingo Boingo
Danny Elfman
Songs: Stay · Not My Slave · Just Another Day · Grey Matter · No Spill Blood
OklahomaOklahoma
Songs: Oh What A Beautiful Morning · I Cain't Say No · Oklahoma · The Surrey With The Fringe On Top · Out Of My Dreams (Dream Ballet)
 Olaf Malolepski Songs: Tausend rote Rosen
Old Crow Medicine ShowOld Crow Medicine Show
OCMS
Songs: Wagon Wheel
 Oldelaf Songs: La tristitude
 Mike Oldfield Songs: Moonlight Shadow (with Maggie Reilly) · Tubular Bells · To France (feat. Maggie Reilly)
 Oli P. Songs: So Bist Du (Und Wenn Du Gehst...) · I Wish · Flugzeuge Im Bauch · Das Erste Mal Tat's Noch Weh
 Olive Songs: You're Not Alone
Oliver!Oliver!
Musicals & Broadway
Songs: Food, Glorious Food · Consider Yourself · I'd Do Anything · Oom Pah Pah · As Long As He Needs Me
Olly MursOlly Murs
Oliver "Olly" Stanley Murs
Songs: Troublemaker (feat. Flo Rida) · Army Of Two · Dance With Me Tonight · This Song Is About You · Heart Skips A Beat (feat. Rizzle Kicks)
 Olsen Brothers Songs: Fly On The Wings Of Love (Winner Eurovision 2000)
Renee OlsteadRenee Olstead
Songs: Meet Me, Midnight · Hit The Road Jack · Someone To Watch Over Me (feat. Chris Botti) · Breaking Up Is Hard To Do (with Peter Cincotti) · Midnight Man
 Olympic Games Songs: I Believe (Nikki Yanofsky - Vancouver 2010) · Survival (Muse) · Spinnin' for 2012 · Anywhere In The World (Mark Ronson feat. Katy B) · J'imagine (Annie Villeneuve)
 The Olympics Songs: (Baby) Hully Gully · Western Movies
Don OmarDon Omar
Songs: Taboo · Hasta que salga el sol · Danza kuduro · Zumba · Sudando
 Omarion Songs: O · Ice Box · Let Me Hold You (with Lil' Bow Wow)
 OMC Songs: How Bizarre
 Once Songs: Falling Slowly (Glen Hansard & Markéta Irglová)
One DirectionOne Direction
Songs: What Makes You Beautiful · One Way Or Another (Teenage Kicks) · Live While We're Young · Little Things · One Thing
 One Night Only Songs: Say You Don't Want It (feat. Emma Watson) · It's About Time · Just For Tonight
 One Tree Hill Songs: Halo (Bethany Joy Lenz) · I Don't Want To Be (Gavin DeGraw) · Be Yourself (Audioslave) · Everybody's Changing (Keane) · I Don't Care (Fall Out Boy)
 One True Voice Songs: Sacred Trust · Shakespeare's Way With Words
OneRepublicOneRepublic
Songs: Feel Again · Come Home · If I Lose Myself · Secrets · Apologize (Timbaland)
 Oomph! Songs: Augen Auf!
 Trijntje Oosterhuis Songs: Kleine Jongen (Live) · Knocked Out · Nu dat jij er bent · De zee · Face In The Crowd (with Lionel Richie)
 Opus Songs: Live Is Life (Live)
Rita OraRita Ora
Songs: Radioactive · R.I.P. (feat. Tinie Tempah) · Shine Ya Light · How We Do (Party) · Lay Down Your Weapons (with K Koke)
Roy OrbisonRoy Orbison
See also: The Traveling Wilburys
Songs: Oh, Pretty Woman · Crying (duet) (with k.d. lang) · Crying · You Got It · Only The Lonely
 Orchestral Manoeuvres in the Dark Songs: Enola Gay
 La oreja de Van Gogh Songs: La niña que llora en tus fiestas · La playa · En mi lado del sofá · Rosas · Sin Miedo a Nada (with Álex Ubago)
 Orelsan Songs: La terre est ronde
 Organiz' Songs: I Never Knew Love Like This Before
 Orgy Songs: Opticon
 Orianthi Songs: According To You
 El Original Songs: Brujula de amor
 Orleans Songs: Still The One · Dance With Me
 Peter Orloff Songs: Ich Liebe Dich · Cora Komm Nach Haus · Königin Der Nacht · Königin Der Nacht 2002 · Ein Mädchen Für Immer
 Antonio Orozco Songs: Una y otra vez · Es mi soledad · La cuestión
 Stacie Orrico Songs: Stuck · (There's Gotta Be) More To Life · Instead · I'm Not Missing You
 Michel Orso Songs: Medley Gilbert Bécaud · Angélique
 Orson Songs: No Tomorrow · Happiness · Bright Idea
 Osborne Brothers Songs: Rocky Top
 Jeffrey Osborne Songs: On The Wings Of Love · Stay With Me Tonight · You Should Be Mine (The Woo Woo Song) · In Your Eyes · Far Longer Than Forever (in duet with Regina Belle, The Swan Princess)
Joan OsborneJoan Osborne
Songs: One Of Us · Right Hand Man · Crazy Baby · Righteous Love · St. Teresa
 Kelly Osbourne Songs: Papa Don't Preach · One Word · Changes (feat. Ozzy Osbourne)
Ozzy OsbourneOzzy Osbourne
See also: Black Sabbath & Kelly Osbourne
Songs: Crazy Train · I Don't Know · Dreamer · Goodbye To Romance · No More Tears
 K.T. Oslin Songs: Do Ya · 80's Ladies · I'll Always Come Back · Hey Bobby · Come Next Monday
 Emily Osment Songs: Wherever I Go
Donny OsmondDonny Osmond
See also: The Osmonds, Marie Osmond & Jimmy Osmond
Songs: Puppy Love · Go Away Little Girl · A Little Bit Country, A Little Bit Rock 'N Roll (with Marie Osmond) · The Twelfth Of Never · I'm Leaving It (All) Up To You (with Marie Osmond)
 Jimmy Osmond Songs: Mother of Mine · Long Haired Lover From Liverpool
 Marie Osmond Songs: A Little Bit Country, A Little Bit Rock 'N Roll (with Donny Osmond) · Paper Roses · I'm Leaving It (All) Up To You (with Donny Osmond)
 The Osmonds Songs: One Bad Apple · Love Me For A Reason · Crazy Horses · Goin' Home · Let Me In
Otis Day And The KnightsOtis Day And The Knights
Musical film National Lampoon's Animal House
Songs: Shama Lama Ding Dong · Shout
OttawanOttawan
Songs: D.I.S.C.O (English version) · Hands Up (Give Me Your Heart) · Megamix · D.I.S.C.O (version française) · T'es OK
 Otto Knows Songs: Million Voices
 James Otto Songs: Just Got Started Lovin' You · These Are The Good Old Days · Days Of Our Lives
 Ou Est Le Swimming Pool Songs: Dance The Way I Feel
 Our Lady Peace Songs: Where Are You · Somewhere Out There
 Outasight Songs: Tonight Is The Night
The OutfieldThe Outfield
Songs: Your Love · Since You've Been Gone · All The Love · For You
 The Outhere Brothers Songs: Boom Boom Boom · If You Wanna Party (with Molella)
 OutKast Songs: Hey Ya! ((Radio Mix/Club Mix)) · Elevators (Me & You) · Land Of A Million Drums · Ms. Jackson · Mighty 'O'
 Outlandish Songs: Aïcha
 Outlaws Songs: Ghost Riders In The Sky · Green Grass And High Tides
 Outwork Songs: Elektro (Dance Remix)
 Gaston Ouvrard Songs: Je n'suis pas bien portant
The OvertonesThe Overtones
Songs: Runaround Sue · Reet Petite · In The Still Of The Night · Blue Moon · Why Do Fools Fall In Love
Jake OwenJake Owen
Songs: Barefoot Blue Jean Night · Alone With You · Eight Second Ride · Don't Think I Can't Love You · Yee Haw
 Mark Owen Songs: Four Minute Warning
 Randy Owen Songs: Braid My Hair
Buck OwensBuck Owens
Songs: Rollin' In My Sweet Baby's Arms · Together Again · Act Naturally · Pfft You Were Gone (Hee Haw Theme) · Keys In The Mailbox
 Ginny Owens Songs: With Me · I Am
Owl CityOwl City
Adam Young
Songs: Good Time (with Carly Rae Jepsen) · Fireflies · Shine Your Way (feat. Young & Yuna) · Vanilla Twilight · Umbrella Beach
 Anna Oxa Songs: Senza di me · Non Scendo
 Ozark Mountain Daredevils Songs: Jackie Blue · If You Wanna Get To Heaven
 John Ozila Songs: Medley tropical