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, 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 |
| Oats, Wild | Oattes Van Schaik | Obassey, Patty |
| Obel, Agnes | Obelisk | Obernik, Sam |
| Oberon | Oberst, Conor | Obey The Brave |
| Obey, Ebenezer | OBF | Obi |
| Obi, Ras | Obie Trice | Obituary |
| Objayda | Obliveon | Obraztsova, Elena |
| Obsession | Obus | Ocasek, Ric |
| Occasion, The | Occasional Few, The | Occasional Five, The |
| Occasional Project, The | Occasionally David | Ocean |
| Ocean (Modern Soul) | Ocean Colour Scene | Ocean Grove |
| Ocean Party, The | Ocean, Billy | Ocean, Humphrey |
| Oceanic | 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-Shore | Offenbach (Rock) |
| Offenbach, Jacques | Offhooks, The | Official Secrets, The |
| Offshore | Offspring | Ofshore |
| Ofwerman, Rune | Ogan, Gary & Lamb, Bill | 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 |
| 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 | 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 | Omen |
| Omen III | Omerta | Omi, Sonik |
| Omit | Omni Trio | Omnium Gatherum |
| 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 |
| One | One 2 Many | 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 | 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 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, Cardboard | Orchestra, Peace | 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 | Orchids (60S), The |
| Orchids, The | Ordeal, DJ | Order Of Apollyon, The |
| Order, Bogus | 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 | 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 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, Michael | Orrall, Robert Ellis | Orrico, Stacie |
| ORS | Orson | Orson Family, The |
| Ortega, Jeannie | 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 | 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 |
| 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 Kid | Our Lady Peace |
| Our Lunar Activities | Our Tribe | Ousset, Cécile |
| Out Cold | 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 | Outpatience, The |
| Outrage | Outrider | Outside |
| Outsiders (Punk), The | Outsiders, The | Outsiders, The |
| Outsiders, The | Outsiders, The (US) | Outskirts Of Infinity |
| Outskirts, The | Ova | Oval |
| Ovary Lodge | Overall, Kassa | Overdraft, The |
| 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 |