O   | O Fracas | O Level |
| O Suilleabhain, Micheal | O Toole, Peter | O Yuki Conjugate |
| O'Banion, John | O'Brien, Conan | O'Brien, Deke |
| O'Brien, Dermot | O'Brien, Erin | O'Brien, Hod |
| O'Brien, Michael | O'Brien, Tim | O'Brien-Docker, Ian |
| O'Brien-Docker, John | O'Bryan | O'Bryant's Washboard Wonders |
| O'Casey, R. | O'Casey, Sean | O'Connell, Helen |
| O'Connell, Maura | O'Connor, Cavan | O'Connor, Des |
| O'Connor, Hazel | O'Connor, Kathie | O'Connor, Sinead |
| O'Connor, Tom | O'Day, Alan | O'Day, Anita |
| O'Donnell Roger | O'Donnell, Al | O'Donnell, Daniel |
| O'Donnell, Joe | O'Donnell, Rosie | O'Dowd, Barry |
| O'Dowda, Brendan | O'Duffy, Michael | O'Farrill, Chico |
| O'Flynn, Liam | O'Gwynn, James | O'Hagan, Sean |
| O'Hara, John | O'Hara, Mary | O'Hara, Mary Margaret |
| O'Hara, Maureen | O'Hearn Patrick | O'Jays, The |
| O'Kane, John | O'Kanes, The | O'Kaysions, The |
| O'Keefe, Danny | O'Keefe, Peggy | O'List, David |
| O'Malley, Stephen | O'Meara, Jo | O'Neal, Alexander |
| O'Neal, Johnny | O'Neal, Shaquille | O'Neil, Sandy |
| O'Riordan, Dolores | O'Rouke, Jim | O'Rourke, Declan |
| O'Rourke, Jim | O'Sullivan, Daniel | O'Sullivan, Gilbert |
| O, Karen | O-Town | O. J. Abbott |
| O.A.R (Of A Revolution) | O.C Roberts | O.C. |
| O.D, Adrenalin | O.G.C. | O.M.D. |
| O.T. Quartet | O.T.T | Oak |
| Oak Ridge Boys, The | Oak, Crooked | Oakenfull, Ski |
| Oakenshield | Oakey & Moroder | Oakley, Gee |
| Oaktown's 3-5-7 | Oasis (Dutch) | Oasis (Mary Hopkin) |
Oasis (UK) | Oasis (US) | Oates John |
| Oates, Jackie | Oath, The | Oats, Wild |
| Oattes Van Schaik | Obassey, Patty | Obelisk |
| Obernik, Sam | Oberst, Conor | Obey The Brave |
| Obey, Ebenezer | OBF | Obi |
| Obie Trice | Obituary | Objayda |
| Obliveon | Obraztsova, Elena | Obsession |
| Obus | Ocasek, Ric | Occasion, The |
| Occasional Few, The | Occasional Five, The | Occasional Project, The |
| Ocean | Ocean Colour Scene | Ocean Party, The |
| Ocean, Billy | Ocean, Humphrey | Oceanic |
| Oceansize | Ochil Players, The | Ochs, Phil |
| Ockeghem, Johannes | Octave One | Octavia |
| Octavian | October Country | October, Gene |
| Octopus | Odd Man Out | Oddie, Bill |
| Odds & Ends | Odell, Tom | Odetta |
| Odin | Odnoposoff, Ricardo | Odrich, Ron |
| Odyssey | Odyssey | Odyssey, The |
| Of Arrowe Hill | Of Mice & Men | Of Monsters And Men |
| Of Montreal | Ofarim, Esther | Off |
| Off The Wall | Off With Their Heads | Off-Shore |
| Offenbach, Jacques | Offhooks, The | Official Secrets, The |
| Offshore | Offspring | Ofshore |
| Ofwerman, Rune | Ogan, Gary & Lamb, Bill | Ogdens, The |
| Ogdon, John | Ogdon, John & Lucas, Brenda | Ogerman, Claus |
| Ogermann, Claus | Oggum | Ogunde, Hubert |
| Ogura, Kei | Oh No | Oh No Ono |
| Oh Ok | Oh Well | Oh Wonder |
| Oh! Polo | Oh' Dev | Oh, Atoms |
| Oh, Nadia | ohGr | OHGR WELT |
| Ohi Ho Bang Bang | Ohio Express | Ohio Players |
| Ohlsson, Garrick | OHM | Ohno, Shunzo |
| Ohno, Yuji | Ohnuki, Taeko | Oi Polloi |
| Oil Seed Rape | Oingo Boingo | OISIN |
| Oïstrakh, David | Oïstrakh, David & Igor | Oïstrakh, Igor |
| Oizone | Ojo, Dele | OK Go |
| OK Jive | Okay Temiz | Okereke, Kele |
| Okino, Shuya | Okino, Yoshihiro | Okkervil River |
| Okosun, Sonny | Ol Dirty Bastard | Oladimeji & His Talking Drum |
| Olatunji, Babatunde | Olavide, Begoña | Olay, Ruth |
| OLD | Old And In The Way | Old Crow Medicine Show |
| Old Fashioned Love | Old Gold | Old Man River |
| Old Metropolitan Band | Old Mole Band, The | Old Skool Orchestra |
| Old Skull | Old Swan Band, The | Oldfield, Harry |
| Oldfield, Mike | Oldfield, Natasha | Oldfield, Sally |
| Oldfield, Terry | Oldham Tinkers, The | Oldham, Andrew Loog |
| Oldham, Will | Oldland Montano | Oldland, Misty |
| Ole Ole | Oleander | Olenn, Johnny |
| Oli Max & D.J. Shapps | Oli.P | Olive |
| Olive Juice | Olive, Brian | Olivelawn |
| Oliver | Oliver Books calendars | Oliver Dawson Saxon |
| Oliver Naylor's Seven Aces | Oliver, David | Oliver, Frankie |
| Oliver, Graham | Oliver, King | Oliver, Mickey |
| Oliver, Sy | Oliveri, Nick | Olivia De Havilland |
| Olivia Tremor Control, The | Olivier, Laurence | Olivor, Jane |
| Ollie & Jerry | OLO Worms | Olsen, Angel |
| Olsen, George | Olsher, Lesley | Olson, Mark |
| Olsson, Kai | Olsson, Mats And His Orchestra | Olympia Dukakis |
| Olympic Bouzouki Group, The | Olympic Lifts | Olympic Runners |
| Olympic World | Olympics, The | Omar |
| Omar And The Howlers | Omarion | Omartian, Michael |
| Omartian, Michael And Stormie | OMC | Omega |
| Omega Amoeba | Omega Tribe | Omen |
| Omen III | Omerta | Omi, Sonik |
| Omni Trio | Omowura, Ayinla | Omsk Russian Ensemble, The |
| On Offs, The | On Parole | On The One |
| On The Seventh Day | On The Speakers | On/Off |
| Once Again | Once Blue | Onda Del Futuro |
| One | One 2 Many | One Blood |
| One Day As A Lion | One Dove | One God Universe |
| One Hand One Heart | One Hundred Ton And A Feather | One Hundred Words For Snow |
| One II One | One In A Million | One Lady Owner |
| One Minute Silence | One More Time | One Nation |
| One Night Only | One O'Clock Gang | One The Juggler |
| One Thousand Violins | One Three, The | One To One |
| One Trive | One True Voice | One Word |
| One, Act | One, Arkestra | One, As |
| One-Eyed Jacks | Oneida | Onelinedrawing |
| Oneness Of Juju | Oneohtrix Point Never | OneRepublic |
| Ones, The | OneTwo | Ong, Olivia |
| Onionhead | Only Child | Only If You Call Me Jonathan |
| Only Lonely | Only Ones | Only Real |
| Ono, Kim | Ono, Seigen | Ono, Yoko |
| Onom Agemo & The Disco Jumpers | Onono, Ben | Onset, The |
| Onslaught | Onuora, Oku | Onward International |
| Onyeabor, William | Onyeka The Torch | Onyx |
| Onyx, The | Ooberman | Oomph |
| Oosterhuis, Trijntje | Oozay | Oozing Wound |
| Opa | Opal | Opal Butterfly |
| Opaz | OPE | Opel, Jackie |
| Open Hand | Open In Obscurity | Open Mind, The |
| Open Road | Open Sky | Open, The |
| Operahouse | Operation Ivy | Operator Please |
| Operators, The | Opeth | OPM |
| OPM (Disco) | Oporto | Opossom |
| Oppenheimer | Opposition | Opsahl & Lindstedt |
| Optic Eye | Optimist Club | Optimum Wound Profile |
| Optimystic | Opus | Opus Dead |
| Opus III | Opus Int Music Ltd | Or-N-More |
| Ora | Ora, Rita | Orabge |
| Oral Exciters, The | Oram, Daphne | Orange Alabaster Mushroom, The |
| Orange And Blue | Orange Bicycle, The | Orange Blossom Sound |
| Orange Can | Orange Deluxe | ORANGE GOBLIN |
| Orange Juice | Orange Lights, The | Orange Peel |
| Orange Power | Orange, Richard | Oranger |
| Orans | Orb | Orbidöig |
| Orbison, Roy | Orbit, William | Orbital |
| Orbo Equitum Solis | Orca | Orch. Of The Amsterdam Phil. |
| Orchard, Pat | Orchestra Baobab | Orchestra Filarmonica Di Roma |
| Orchestra Folklore Di Romagna | Orchestra Luna | Orchestra Makassy |
| Orchestra Of St. James, The | Orchestra Of The Opera-Comique | Orchestra Tango Cafe |
| Orchestre De L'O.R.T.F. | Orchestre De La Suisse Romande | Orchestre De Monte Carlo |
| Orchestre Eddie Roger | Orchestre Jazira | Orchestre T.P.O.K. Jazz |
| Orchid | Orchids (60S), The | Orchids, The |
| Ordeal, DJ | Order, Bogus | Ordinary Boys, The |
| Ordinary Man | Oregon | Orellana, Raúl |
| Orff, Carl | Orford, Martin | Organ, The |
| Organisation | Organisms | Organization |
| Organized Konfusion | Organum | Orgazmo |
| Orgy | Orianthi | Orielle |
| Oriental Wind | Origin Unknown | Origin, The |
| Original Bedroom Rockers | Original Cast Recording | Original Concept |
| Original Dixieland Jazz Band | Original Mirrors | Original Sound Track, The |
| Original Soundtrack | Original Surfaris | Original Trinidad Steel Band |
| Original Tuxedo Jazz Band, The | Original, The | Originals, The |
| Orioles, Felders | Orioles, The | Orion (Elvis) |
| Orion (Ryan Adams) | Orion The Hunter | Orkest, Metropole |
| Orkestra | Orlando (60s) | Orlando (90s) |
| Orlando Johnson & Trance | Orlando Quartet | Orlando, Tony & Dawn |
| Orleans | Orlons, The | Orme, Le |
| Ormonde Folk, The | Ornadel, Cyril | Ornament |
| Ornamental | Orozco, Rafael | Orphan Egg |
| Orpheus | Orphic Soop | Orquesta De Antonio Bustamante |
| Orquesta Española De Baile | Orquestra Casino De Sevilla | Orquestra Sinfônica Brasileira |
| Orr, Benjamin | Orrall, Robert Ellis | Orrico, Stacie |
| ORS | Orson | Orson Family, The |
| Ortega, Jeannie | Ortiz, Cristina | Ortolani, Riz |
| Orton, Beth | Orwell, Paul | Ory, Kid |
| Ory,Kid And Allen, Red | Oryema, Geoffrey | Orzabal, Roland |
| Os Caretas | Os Diagonais | OS Mutantes |
| Os Originais Do Samba | Osa, Sigbjørn Bernhoft | Osborne & Giles |
| Osborne Brothers, The | Osborne, Jeffrey | Osborne, Joan |
| Osborne, Mike | Osborne, Mike & Tracey, Stan | Osborne, Paul |
| Osborne, Tony | Osbourne, Johnny | Osbourne, Ozzy |
| Osby, Greg | Oscar | Oscar Peterson & Milt Jackson |
| Oscillation, The | Ose | OSH |
| Oshik Levy & Naftaly Alter | OSI | Osibisa |
| Osipov Academic Russian Folk O | Osiris | Oskar, Lee |
| Oslin, K.T. | Oslo Philharmonic Orchestra | Osmond Boys |
| Osmond, Donny | Osmond, Jimmy | Osmond, Marie |
| Osmonds, The | Osmosis | Ossian |
| Ossie & The Upsetters | Osterman Weekend, The | Ostrogoth |
| Osymyso | Otep | Other Half, The |
| Other Ones (80S), The | Other Ones, The | Other People |
| Other Two, The | Othermothers, The | Others [1960S], The |
| Otherwise | Otis & The King Pins | Otis Johnny |
| Otis Williams And His Charms | Otis, Byron | Otis, Ed & Ben |
| Otis, Shuggie | Ottawan | Ottewell, Ben |
| Otway & Barrett | Otway John | Ou Est Le Swimming Pool |
| Ouch | Oui 3 | Ouida & The Numbers |
| Ounsworth, Alec | Our American Cousins | Our Broken Garden |
| Our Daughters Wedding | Our Favourite Band | Our Future Feelings |
| Our Girl | Our Heaven | Our Kid |
| Our Lady Peace | Our Lunar Activities | Our Tribe |
| Ousset, Cécile | Out Of Darkness | Out Of My Hair |
| Out Of The Blue | Out Of Your Mouth | Out With Mummy |
| Out, Papercut | Out, The | Out-Phaze |
| Outcasts | Outcry Collective | Outer Limits |
| Outer Limits, The | Outfield | Outhere Brothers, The |
| Outkast | Outlander | Outlandish |
| Outlaw Blues Band, The | Outlaws, The (Country) | Outlaws, The (UK) |
| Outlaws, The (US) | Outline, The | Outloud |
| Outnumbered, The | Outpatience, The | Outrage |
| Outrider | Outside | Outsiders (Punk), The |
| Outsiders, The | Outsiders, The | Outsiders, The |
| Outsiders, The (US) | Outskirts Of Infinity | Outskirts, The |
| Ova | Ovary Lodge | Overall, Kassa |
| Overdraft, The | Overkill | Overlanders, The |
| Overload, Honcho | Overlord | Overlords, The |
| Overmono | Override | Overstreet, Tommy |
| Overtones, The | Owen | Owen And Leon |
| Owen, Mark | Owen, Michael | Owen, Ray |
| Owen, Reg | Owen, Sid & Patty Palmer | Owens, Buck |
| Owens, Frank | Owens, Jack | Owens, Jamie |
| Owens, Jimmy | Owens, Robert | Owens, Tim 'Ripper' |
| Owens, Tony | Owl Service, The | Owls |
| Oxbow | Oxfam Glamour Models | Oxford Nights, The |
| Oxford, Vernon | Oxide Neutrino | Oxley, Louie |
| Oxley, Tony | OXO | Oxy And The Morons |
| Oxym | Oyster Band, The | Oysterband |
| Oysterhead | Oyuugi Wagamama Dan X PaRADEiS | OZ Magazine |
| Ozark Mountain Daredevils, The | Ozo | Ozomatli |
| Ozone | Ozone, Makoto | Ozric Tentacles |
| Ozu, Masahiko | Ozzie Warlock And The Wizards |