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'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. J. Abbott | O. P. Nayyar | O.A.R (Of A Revolution) |
| O.C Roberts | O.C. | O.D, Adrenalin |
| O.G.C. | O.M.D. | O.T. Quartet |
| O.T.T | Oak | Oak Ridge Boys, The |
| Oak, Crooked | 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 | 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 | Oceansize |
| Ochil Players, The | Ochs, Phil | Ockeghem, Johannes |
| 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 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 | Ol Dirty Bastard |
| Oladimeji & His Talking Drum | Olatunji, Babatunde | 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, 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 Word | One, Act | One, Arkestra |
| One, As | One, Bold | 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 | 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 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 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 | Orb | Orbidöig |
| Orbison, Roy | Orbit, William | Orbital |
| Orbo Equitum Solis | Orca | Orcas |
| Orch. Of The Amsterdam Phil. | 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, 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 |
| Oriental Wind | Origin | Origin Unknown |
| Origin, The | Original Bedroom Rockers | Original Brasso Band, The |
| Original Cast Recording | Original Concept | Original Dixieland Jazz Band |
| 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 | 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 |
| Orrall, Robert Ellis | Orrico, Stacie | ORS |
| Orson | Orson Family, The | Ortega, Jeannie |
| Ortiz, Cristina | Ortolani, Riz | Orton, Beth |
| Orwell, Paul | 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 | Osorio, Jorge Federico |
| Ossian | Ossie & The Upsetters | Ossie Layne Show, The |
| Osterman Weekend, The | Ostrogoth | Osymyso |
| Otep | 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 | Otway & Barrett | Otway John |
| Ou Est Le Swimming Pool | Ouch | 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 Hud |
| 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, 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 | Owston, Chuck |
| Oxbow | Oxfam Glamour Models | Oxford Nights, The |
| Oxford, Vernon | Oxide Neutrino | Oxley, Louie |
| Oxley, Tony | OXO | Oxxo Xoox |
| Oxy And The Morons | 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 |