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'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. |
| 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 | 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 |
| Obliveon | Obraztsova, Elena | 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 | Oculus | Odd Man Out |
| Oddie, Bill | Odds & Ends | Odell, Tom |
| Odetta | Odin | Odnoposoff, Ricardo |
| 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 | Off |
| Off The Wall | Off With Their Heads | OFF! |
| Off, Half | Off-Shore | Offenbach (Rock) |
| Offenbach, Jacques | 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 |
| 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 | Ohhms | 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 |
| Okkultokrati | Okosun, Sonny | Okumoto, Ryo |
| Ol Dirty Bastard | 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 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, 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 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 | Ondskapt | One |
| One 2 Many | One AM Radio, The | 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 Way System |
| One Way Ticket | One Word | One, Act |
| One, Arkestra | One, As | One, Bold |
| One-Eyed Jack | 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 | 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 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, Richard |
| Oranger | Orans | Oranssi Pazuzu |
| Orb | 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 St. James, The |
| Orchestra Of The Opera-Comique | Orchestra Tango Cafe | Orchestra, Apocalypse |
| Orchestra, Cardboard | 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, The |
| Orcustus | Ordeal, DJ | Order Of Apollyon, The |
| Order, Bogus | Order, Natural | Order, Outlaw |
| 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 | 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 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 | 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 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 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 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 |
| 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) | 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 |
| 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 | Ozzie Warlock And The Wizards |