O   | O | O Fracas |
| O Level | 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, 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'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, Daniel | O'Sullivan, Gilbert | O, Karen |
| O, Rob | O-Town | O. J. Abbott |
| 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 | 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 Colour Scene | Ocean Party, The | Ocean, Billy |
| Ocean, Humphrey | Oceanic | Oceansize |
| Ochil Players, The | Ochs, Phil | Ockeghem, Johannes |
| Octagon Man, The | Octave One | Octavia |
| Octavian | October Country | October Tide |
| October, Gene | Octopus | 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 | 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, 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 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 | 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 | Omni Trio | Omowura, Ayinla |
| Omsk Russian Ensemble, The | On Offs, The | On Parole |
| On The One | On The Seventh Day | On The Speakers |
| On Trial | On/Off | Once & Future Band |
| Once Again | Once Blue | 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 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 | 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 Mind, The | Open Road | Open Sky |
| Open, The | Operahouse | Operation Ivy |
| Operator Please | Operators, The | Opeth |
| OPM | OPM (Disco) | Oporto |
| Opossom | Oppenheimer | Opposition |
| Opsahl & Lindstedt | Optic Eye | 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 |
| 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 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 | Oriental Wind | Origin |
| Origin Unknown | Origin, The | Original Bedroom Rockers |
| 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 | 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 |
| 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 |
| Osterman Weekend, The | Ostrogoth | Osymyso |
| Otep | Other Half, The | Other Ones (80S), The |
| Other Ones, The | Other People | Other Two, The |
| Othermothers, The | Others [1960S], The | Otherwise |
| Otis & The King Pins | Otis Johnny | Otis Williams And His Charms |
| 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 Of Darkness | Out Of My Hair | Out Of The Blue |
| Out Of Your Mouth | 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 | Ovary Lodge | Overall, Kassa |
| Overdraft, The | Overkill | Overlanders, The |
| Overload, Honcho | Overload, Shifty | Overlord |
| Overlord (Punk) | Overlords, The | Overmono |
| Override | Overstreet, Tommy | Overtones, The |
| Owen | Owen And Leon | Owen, Mark |
| Owen, Michael | Owen, Ray | Owen, Reg |
| Owen, Sid & Patty Palmer | Owens, Buck | Owens, Frank |
| Owens, Jack | Owens, Jamie | Owens, Jimmy |
| Owens, Robert | Owens, Tim 'Ripper' | Owens, Tony |
| Owl Service, The | Owls | Oxbow |
| Oxfam Glamour Models | Oxford Nights, The | Oxford, Vernon |
| Oxide Neutrino | Oxley, Louie | Oxley, Tony |
| OXO | Oxy And The Morons | Oxym |
| Oyster Band, The | Oysterband | Oysterhead |
| Oyuugi Wagamama Dan X PaRADEiS | OZ Magazine | Ozark Mountain Daredevils, The |
| Ozo | Ozomatli | Ozone |
| Ozone, Makoto | Ozric Tentacles | Ozu, Masahiko |
| Ozzie Warlock And The Wizards |