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, Fran | 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 | Obstruct |
| 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 |
| Offering | 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 | Ondara, J.S. | 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 Of You |
| 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 Sun |
| 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, Fire! | 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 |
| Orta, Paul | 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, Royel | 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, Strung | Out, The | Out-Phaze |
| Outburst | Outcast | 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 | Ovaltineys, The |
| Ovary Lodge | Overall, Kassa | Overdraft, The |
| Overexposure | Overkill | Overlanders, The |
| Overload | Overload, Honcho | Overload, Shifty |
| Overlord | Overlord (Punk) | Overlord X |
| Overlords, The | Overmono | Override |
| Oversize | 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 |