| O Rappa |
| O Town |
| O'funkillo |
| O'Ryan |
| O'Town |
| O-Town |
| O-Zone |
| O.A.R. |
| O.A.R. (Of A Revolution) |
| O.C. |
| O.C. Smith |
| O.F.T.B. |
| O.G Black y Master Joe |
| O.G.R. |
| O.M.D. |
| O.P.M. |
| OAG |
| Oak Ridge Boys |
| Oakey Philip and Moroder Giorgio |
| Oar |
| Oasis |
| Obie Bermudez |
| Obie Trice |
| Obie Trice featuring Busta Rhymes |
| Obie Trice featuring D-12 |
| Obie Trice Featuring D12 & Eminem |
| Obie Trice featuring Dr. Dre & Eminem |
| Obie Trice featuring Eminem |
| Obie Trice featuring Eminem & Dr. Dre |
| Obie Trice featuring Eminem & G-Unit |
| Obie Trice Featuring Jadakiss, Lloyd Banks, N |
| Obie Trice featuring Kon Artist |
| Obie Trice featuring Nate Dogg |
| Obie Trice featuring Timbaland |
| OBK |
| Obrint Pas |
| Obscure Disorder |
| Obus |
| Ocasek Ric |
| Ocean |
| Ocean Blue |
| Ocean Color Scene |
| Ocean Colour Scene |
| Ocean Ou |
| Oceana Und Kim |
| Oceanlab |
| Oceans Of Sadness |
| Ochre |
| Octavia |
| October Fall |
| October Project |
| Odd Nordstoga |
| Of The Son |
| Off Broadway |
| Off By One |
| Officer Down |
| Offspring |
| OFTB |
| OG Spanish Fly |
| Odd Project |
| Ogata Megumi & Hiyama Nobuyuki |
| Ogie Alcasid |
| Ohgr |
| Odds |
| Odette Quesada |
| Ohio Express |
| Ohio Players |
| Oingo Boingo |
| Oingo Boingp |
| Ok Cobra |
| OK Go |
| Okazaki Ritsuko |
| Ol Skool |
| Ol' Dirty Bastard |
| Ol' Dirty Bastard F/ Method Man |
| Ol' Dirty Bastard F/ Method Man, Raekwon |
| Ol' Dirty Bastard Featuring Brooklyn Zoo, Sun |
| Ol' Dirty Bastard Featuring Kelis |
| Ol' Dirty Bastard Featuring Killah Priest |
| Ol' Dirty Bastard Featuring Killah Priest, RZ |
| Ol' Dirty Bastard Featuring Method Man |
| Ol' Dirty Bastard Featuring Method Man, Raekw |
| Ol' Dirty Bastard Featuring RZA |
| Ol' Dirty Bastard Featuring The Genius |
| Old 97's |
| Old And In The Way |
| Old Crow Medicine Show |
| Old Man's Child |
| Oldy Moldy |
| Ole Paus |
| Oleander |
| Oleta Adams |
| Olga |
| Olga Tañon |
| Oli P. |
| Oli-p |
| Oli. P |
| Olive |
| Oliver |
| Oliver And Company |
| Oliver Cheatham |
| Oliver James |
| Oliver Magnum |
| Oliver Onions |
| Olivia |
| Olivia F/ Jimmy Cozier |
| Olivia Featuring 50 Cent |
| Olivia Newton-John |
| Olivia Newton-John & John Farnham |
| Olivia Newton-John & John Travolta |
| Olivia Newton-John & John Travolta |
| Olivia Newton-John & Tina Arena |
| Olivia Olson |
| Olli Banjo |
| Olli Schulz & Der Hund Marie |
| olly |
| Olsen Brothers |
| Oman Freestyle |
| Omarion |
| Ombadon featuring DJ Dox |
| Ombladon |
| Ombladon Featuring Raku |
| OMC |
| OMD |
| Ome Henk |
| Omen |
| Omp |
| Omul Cu Sobolani |
| On Broken Wings |
| On Ice E |
| On the day I was born |
| On the Last Day |
| On The Wings Of Song |
| Ona Vaselina |
| Onda Vaselina |
| Onda Vaselina, La |
| One 2 Many |
| One Bad Pig |
| One Chance |
| One Day Fly |
| One Dollar Short |
| One Dove |
| One Fate |
| One Foot In The Grave |
| One Giant Leap |
| One Giant Leap Ft. Speech And Neneh Cherry |
| One Inch Punch |
| One Less Reason |
| One Line Out |
| One Minute Silence |
| One Nation Crew |
| One Republic |
| One Ton |
| One True Voice |
| One Vision |
| One Vo1ce |
| One Voice |
| One-T |
| Oneiroid Psychosis |
| Onelinedrawing |
| OneSideZero |
| Ongestaagd |
| Ononomous |
| Onsidezero |
| Onyx |
| Onyx F/ 50 Cent, Bonifucco, X-1 |
| Onyx f/ Big Punisher, Noreaga |
| Onyx F/ DMX |
| Onyx F/ Killa Sin, Method Man, Raekwon The Chef, X-1 |
| Onyx F/ Lost Boyz |
| Onyx F/ X-1 |
| Onyx F/ X-1, Clay The Raider |
| Onyx F/All City |
| Ooki Risa |
| Oomoh! & L'ame Immortelle |
| Oomph! |
| Open Hand |
| Operatica |
| Operation Ivy |
| Opeth |
| opgezwolle |
| OPM |
| Optical 2 |
| Oran "Juice" Jones |
| Orange 9mm |
| Orange Blue |
| Orange Range |
| Orbit |
| Orbital |
| Orchestral Manoeuvres In The Dark |
| Ordo Equilibrio |
| Organized Konfusion |
| Orgy |
| Original 3 |
| Original Broadway Cast |
| Original Dutch Cast |
| Oriol Carrio |
| Orion The Hunter |
| Orishas Featuring Heather Headley |
| Orkest Klein |
| Orlando |
| Orleans |
| Orleya |
| Oro |
| Orphanage |
| Orphaned Land |
| Orson |
| Oscar De La Hoya |
| Osdorp Posse |
| OSI |
| Oscar Chávez |
| Ost Full House |
| Ost New Moon |
| Ost Twilight |
| Otep |
| Otis Day And The Knights From Animal House |
| Otis Redding |
| Otis Reding |
| Otis Williams & His Charms |
| Ott |
| Ottawan |
| Otto Serge |
| Ougenweide |
| Ouija |
| Our Lady Peace |
| Ours |
| Out Here On My Own |
| Out Of Eden |
| Out Of Hand |
| Out Of Your Mouth |
| Outblast |
| Outcast Youth |
| Outfield |
| Outhere Brothers |
| Outkast |
| Outladish |
| Outlandisch |
| Outlandish |
| Outlaw |
| Outlaws |
| Outlawz |
| Outlawz F/ Akwylah, Smooth, Trife, Dirty Bert |
| Outlawz F/ Bad Azz, Low Lives, Spice 1 |
| Outlawz F/ Supreme C, Mil |
| Outlawz F/ TQ |
| Outlawz F/ Val Young |
| Outlawz Featuring Akwylah, Smooth, Trife, &am |
| Outlawz Featuring Bad Azz, Low Lives, & S |
| Outlawz Featuring Daz Dillinger |
| Outpost |
| Outsiderz 4 Life |
| Outspoken |
| Outta Control |
| Outthere Brothers |
| OV7 |
| Oval Opus |
| Over The Hills |
| Overdrive Feautring Chromefox |
| Overground |
| Overkill |
| Overseer |
| Oversight |
| Overstreet |
| Owal/Emcedwa |
| Owen |
| Owl City |
| Owsley |
| Oxide & Neutrino |
| Oxide & Neutrino |
| Oxide and Neutrino |
| Oxo |
| Oxymoron |
| ODM |
| Oysterband |
| Oysterhead |
| Ozark Henry |
| Ozark Mountain Daredevils |
| Ozma |
| Ozomatli |
| Ozomatli F/ Chali 2na (Jurassic 5) |
| Ozone |
| Ozzie Fudd |
| Ozzie Nelson |
| Ozzy |
| Ozzy Fudd |
| Ozzy Osbourne |
| Ozzy, Dmx, Ol' Dirty Bastard, Crystal Method |
| ODB F/ Kelis |
| Of Montreal |
