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 |
| Occasionally David | 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 | 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 | 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 '88 | 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 |
| Oren, Peter | Orexis | 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 |
| 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 D' León | 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 | 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, 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 |