O   | O | O Fracas |
| O Level | O Rodney & Cooley Joe | 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, Alison | 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'Halloran Brothers, The | 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'Leary, Johnny | 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, Bernard | O'Sullivan, Daniel | O'Sullivan, Gilbert |
| O, Karen | O, Rob | 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 |
| Obel, Agnes | Obelisk | Obernik, Sam |
| Oberon | 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 |
| Occasionally David | Ocean | Ocean Colour Scene |
| Ocean Party, The | Ocean, Billy | Ocean, Humphrey |
| Oceanic | Oceansize | Ochil Players, The |
| Ochs, Phil | Ockeghem, Johannes | Octagon Man, The |
| Octave One | Octavia | Octavian |
| October Country | October Tide | October, Gene |
| Octopus | Octopus Syng | Oculus |
| 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 | Ofege | Off |
| Off The Wall | Off With Their Heads | OFF! |
| Off-Shore | Offenbach (Rock) | 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 & Rostropovitch |
| 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 Pete & John Christie |
| 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 | Olevsky, Julian | 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 |
| Olney, David | 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 | Om |
| Omar | Omar And The Howlers | Omarion |
| Omartian, Michael | Omartian, Michael And Stormie | OMC |
| Omega | Omega Amoeba | Omega Tribe |
| Omen | Omen III | Omerta |
| Omi, Sonik | Omit | Omni Trio |
| Omnium Gatherum | Omowura, Ayinla | Omsk Russian Ensemble, The |
| Omura, Kenji | On And Ons, The | On Offs, The |
| On Parole | On The Air | On The One |
| On The Seventh Day | On The Speakers | On Trial |
| On/Off | Once & Future Band | 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, Bold |
| 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 |
| Onwenu, Onyeka | 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 | Optic Nerve, The |
| Optimist Club | Optimistas, Los | Optimum Wound Profile |
| Optimystic | Opus | Opus '88 |
| Opus Dead | Opus III | Opus Int Music Ltd |
| Or-N-More | Ora | Ora, Rita |
| Orabge | Oraisòn, Jorge | 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 | Orcas | 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 |
| Orchestra, Peace | Orchestre De L'Association | Orchestre De L'O.R.T.F. |
| Orchestre De La Suisse Romande | Orchestre De Monte Carlo | Orchestre De Paris |
| Orchestre Eddie Roger | Orchestre Jazira | Orchestre T.P.O.K. Jazz |
| Orchid | Orchids (60S), The | Orchids, The |
| Ordeal, DJ | Order Of Apollyon, The | Order, Bogus |
| Ordinary Boys, The | Ordinary Man | Oregon |
| Orellana, Raúl | Oren, Peter | Orexis |
| Orff, Carl | Orford, Martin | Organ, The |
| Organisation | Organisms | Organization |
| Organized Konfusion | Organum | Orgazmo |
| Orgone Box | Orgy | Orianthi |
| Orielle | Orielles, The | Oriental Wind |
| Origin | 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 | Orla Wren | 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 | Orquesta Tipica Union Sanluise |
| 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 Brasileiros |
| 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 & Eugene Wright |
| Oscar D' León | Oscar Peterson & Milt Jackson | Oscillation, The |
| Ose | OSH | Oshik Levy & Naftaly Alter |
| OSI | Osibisa | Osipov Academic Russian Folk O |
| Osiris (Funk) | Osiris (Prog) | Oskar, Lee |
| Oslin, K.T. | Oslo Philharmonic Orchestra | Osmond Boys |
| Osmond, Donny | Osmond, Jimmy | Osmond, Marie |
| Osmonds, The | Osmosis | Osorio, Jorge Federico |
| Ossian | Ossie & The Upsetters | Ossie Layne Show, The |
| 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 Williams And The Midnight Cowboys | 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 On Blue Six |
| 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 | Outlaw, Sam |
| 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 |
| Oval | Ovary Lodge | Overall, Kassa |
| Overdraft, The | Overkill | Overlanders, The |
| Overload | Overload, Honcho | Overload, Shifty |
| Overlord | Overlord (Punk) | 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, Buck & Raye, Susan | Owens, Frank | Owens, Jack |
| Owens, Jamie | Owens, Jimmy | Owens, Robert |
| Owens, Tim 'Ripper' | Owens, Tony | Owl & Mouse |
| Owl Service, The | Owls | Owston, Chuck |
| 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 |
| Ozan, Mehmet | Ozark Mountain Daredevils, The | Ozo |
| Ozomatli | Ozone | Ozone, Makoto |
| Ozric Tentacles | Ozu, Masahiko | Ozzie Warlock And The Wizards |