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'Cuthbert, Martin | O'Day, Alan | O'Day, Anita |
| O'Donnell Roger | O'Donnell, Al | O'Donnell, Alison |
| O'Donnell, Daniel | O'Donnell, Eugene | 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'halloran, Dustin | 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, Johnny |
| 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. | O. J. Abbott |
| O. P. Nayyar | O.A.R (Of A Revolution) | O.C Roberts |
| O.C. | O.Children | O.D, Adrenalin |
| O.G.C. | O.M.D. | O.T. Quartet |
| O.T.T | O.W.L. | Oak |
| Oak Ridge Boys, The | 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 | Oathbreaker | Oats, Wild |
| Oattes Van Schaik | Obassey, Patty | Obel, Agnes |
| Obelisk | Oberhofer | Oberlin, Russell |
| Obernik, Sam | Oberon | Oberst, Conor |
| Obey The Brave | Obey, Ebenezer | Obey, Trust |
| OBF | Obi | Obi, Ras |
| Obie Trice | Obituary | Objayda |
| Objekt | Obliveon | Obraztsova, Elena |
| Obscura | Obsequiae | Obsession |
| Obus | Ocasek, Ric | Occasion, The |
| Occasional Few, The | Occasional Five, The | Occasional Project, The |
| Occasionally David | Occult Burial | Ocean |
| Ocean (Modern Soul) | Ocean Colour Scene | Ocean Grove |
| Ocean Party, The | Ocean, Billy | Ocean, Humphrey |
| Oceanic | Oceano | Oceans Ate Alaska |
| Oceans Of Slumber | Oceansize | Ochil Players, The |
| Ochs, Phil | Ockeghem, Johannes | Octa, Octo |
| Octagon Man, The | Octave One | Octavia |
| Octavian | October Country | October Tide |
| October, Gene | Octopus | Octopus Syng |
| Octotron, Dr | Oculus | Odd Man Out |
| Oddie, Bill | Odds & Ends | Odell, Tom |
| Odesza | Odetta | Odin |
| Odnoposoff, Ricardo | Odonis, Odonis | Odrich, Ron |
| Odyssey | Odyssey | Odyssey, The |
| Of Arrowe Hill | Of Feather And Bone | Of Mice & Men |
| Of Monsters And Men | Of Montreal | Ofarim, Esther |
| Ofege | Oferwintran | Off |
| Off The Wall | Off With Their Heads | OFF! |
| Off, Half | Off-Shore | Offenbach (Rock) |
| Offenbach, Jacques | Offenders, The | Offhooks, The |
| Official Secrets, The | Offshore | Offspring |
| Ofshore | Ofwerman, Rune | Ogan, Gary & Lamb, Bill |
| Ogawa, Yusuke | Ogdens, The | Ogdon, John |
| Ogdon, John & Lucas, Brenda | Ogerman, Claus | Ogermann, Claus |
| Oggum | Ogre, Meaty | Ogunde, Hubert |
| Ogura, Kei | Oh No | Oh No Ono |
| Oh Ok | Oh Well | Oh Wonder |
| Oh! Polo | Oh' Dev | Oh, Atoms |
| Oh, Nadia | Ohashi, Junko | ohGr |
| OHGR WELT | Ohhms | Ohi Ho Bang Bang |
| Ohio Express | Ohio Players | Ohlsson, Garrick |
| OHM | Ohno, Shunzo | Ohno, Yuji |
| Ohnuki, Taeko | Ohrn, Josefin + The Liberation | Ohtani, Kazuo |
| 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 | Okkultokrati |
| Okosun, Sonny | Oktagon | Okumoto, Ryo |
| Ol Dirty Bastard | Ola | Oladimeji & His Talking Drum |
| Olatunji, Babatunde | Olausson, Jakob | Olavide, Begoña |
| Olay, Ruth | OLD | Old And In The Way |
| Old Crow Medicine Show | Old Fashioned Love | Old Gods Of Asgard |
| Old Gold | Old Man Gloom | 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, Mondeé |
| Oliver, Sy | Oliveri, Nick | Olivia De Havilland |
| Olivia Tremor Control, The | Olivier, Laurence | Olivor, Jane |
| Ollie & Jerry | Olney, Dave | 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 | Omegavortex |
| Omen | Omen III | Omen, Macabre |
| Omerta | Omi, Sonik | Omit |
| Omni | Omni Trio | Omnium Gatherum |
| Omori, Hinako | Omowura, Ayinla | Omsk Russian Ensemble, The |
| Omura, Kenji | On 1 Crew | On And Ons, The |
| On Offs, The | On Our Own Clock | 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 |
| Once Human | Onda Del Futuro | Ondatrópica |
| Ondolo, John | Ondskapt | One |
| One [AOR] | One 2 Many | One AM Radio, The |
| One Blood | One Car Pile-Up | 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 Way System | One Way Ticket |
| One Word | One, Act | One, Arkestra |
| One, As | One, Bold | One, Para |
| One-Eyed Jack | One-Eyed Jacks | OneDa |
| Oneida | Oneirogen | 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 |
| Only, Jerry | 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 Book |
| Open Hand | Open In Obscurity | Open Mike Eagle |
| Open Mind, The | Open Road | Open Sky |
| Open, The | Operahouse | Operation Ivy |
| Operator Please | Operators, The | Opeth |
| Ophthalamia | Opium Lord | 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 [Rock] |
| Opus Dead | Opus III | Opus Int Music Ltd |
| Or-N-More | Ora | Ora, Rita |
| Orabge | Oraisòn, Jorge | Oral |
| Oral Exciters, The | Oram, Daphne | Orange (Shoegaze) |
| 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, Mandolin |
| Orange, Richard | Oranger | Orans |
| Oranssi Pazuzu | ORB | Orb |
| Orb, Alice's | Orbidöig | Orbison, Joy |
| Orbison, Roy | Orbit, William | Orbital |
| Orbo Equitum Solis | Orca | Orcas |
| Orch. Of The Amsterdam Phil. | Orchard, Marble | Orchard, Pat |
| Orchestra Baobab | Orchestra Filarmonica Di Roma | Orchestra Folklore Di Romagna |
| Orchestra Luna | Orchestra Makassy | Orchestra Of Skin & Bone |
| Orchestra Of St. James, The | Orchestra Of The Opera-Comique | Orchestra Tango Cafe |
| Orchestra, Apocalypse | Orchestra, Cardboard | Orchestra, Dadavistic |
| Orchestra, Hidden | Orchestra, Peace | Orchestra, Sauter-Finegan |
| 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 |
| Orchid (DOOM) | Orchids (60S), The | Orchids (Rock), The |
| Orchids, The | Orcustus | Ordeal, DJ |
| Order Of Apollyon, The | Order, Bogus | Order, Natural |
| Order, Outlaw | Ordinary Boys, The | Ordinary Man |
| Ordination Of Aaron | Oregon | Orellana, Raúl |
| Oren, Peter | Orexis | Orff, Carl |
| Orford, Martin | Organ, M. | Organ, The |
| Organisation | Organisms | Organization |
| Organized Konfusion | Organum | Orgazmo |
| Orgone Box | Orgy | Orianthi |
| Orielle | Orielles, The | Orient Express |
| Oriental Wind | Origami Angel | Origin |
| Origin Unknown | Origin, The | Original Bedroom Rockers |
| Original Brasso Band, The | Original Cast Recording | Original Concept |
| Original Dixieland Jazz Band | Original DJ Vibes | 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 |
| Orleans, Ela | Orlons, The | Orme, Le |
| Ormonde Folk, The | Ornadel, Cyril | Ornament |
| Ornamental | Oroonies, The | Orozco, Rafael |
| Orphan | Orphan Egg | Orpheus |
| Orphic Soop | Orquesta De Antonio Bustamante | Orquesta Española De Baile |
| Orquesta La Justicia | Orquesta La Solución | Orquesta Tipica Union Sanluise |
| Orquestra Casino De Sevilla | Orquestra Sinfônica Brasileira | Orr, Benjamin |
| Orr, Buxton | Orr, Michael | Orrall, Robert Ellis |
| Orrico, Stacie | ORS | Orson |
| Orson Family, The | Ortega, Jeannie | Ortega, Lindi |
| Orthodox | Ortiz, Cristina | Ortolani, Riz |
| Orton, Beth | Orwell, Paul | Orwells, The |
| 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 | Osanna | 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 | Osiah | 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 |
| Oso, Oso | Osorio, Jorge Federico | Ossian |
| Ossie & The Upsetters | Ossie All Stars | Ossie Layne Show, The |
| Osterman Weekend, The | Ostrogoth | Osunlade |
| Osymyso | Otep | Other Half |
| Other Half, The | Other Ones (80S), The | Other Ones, The |
| Other People | Other Two, The | OTHERLiiNE |
| 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 |
| OTTO | Otway & Barrett | Otway John |
| Ou Est Le Swimming Pool | Ouch | Ought |
| 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 Hollow Our Home | Our Kid |
| Our Lady Peace | Our Lunar Activities | Our Tribe |
| Ousset, Cécile | Out | Out Cold |
| Out For Justice | Out Hud | Out Lines |
| Out Of Darkness | Out Of My Hair | Out Of The Blue |
| Out Of Your Mouth | Out On Blue Six | Out With A Bang! |
| Out With Mummy | Out, Papercut | Out, The |
| Out-Phaze | Outburst | Outcasts |
| Outcry Collective | Outer Limits | Outer Limits, The |
| Outerlimit, 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 | Outo |
| Outpatience, The | Outrage | Outrider |
| Outside | Outsiders (Punk), The | Outsiders, The |
| Outsiders, The | Outsiders, The | Outsiders, The (US) |
| Outskirts Of Infinity | Outskirts, The | Ov Sulfur |
| Ova | Oval | Ovary Lodge |
| Overall, Kassa | Overdraft, The | Overexposure |
| Overkill | Overlanders, The | Overload |
| Overload, Honcho | Overload, Shifty | Overlord |
| Overlord (Punk) | Overlord X | Overlords, The |
| Overmono | Override | Overstreet, Tommy |
| Overtones, The | Owen | Owen And Leon |
| Owen, Dylan | Owen, Mark | Owen, Michael |
| Owen, Nelson | 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 | Owls, Fewer | Owston, Chuck |
| Ox Scapula | Oxbow | Oxfam Glamour Models |
| Oxford Nights, The | Oxford, Vernon | Oxide Neutrino |
| Oxley, Louie | Oxley, Tony | OXO |
| Oxxo Xoox | Oxy And The Morons | Oxygen Destroyer |
| 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 | Ozz |
| Ozzie | Ozzie Warlock And The Wizards |