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, 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 |
| 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 | 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 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 | 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 |