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'Neill, Matthew | 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., Jenny |
| O.A.R (Of A Revolution) | O.C Roberts | O.C. |
| O.Children | O.D, Adrenalin | O.G.C. |
| O.M.D. | O.R.B | 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 | Oblivion, Heron |
| 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 |
| 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 Liberatio | 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 Eleven Heavy | 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 |
| Onra | 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 |