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'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-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 | 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, 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-Shore |
| 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/Off |
| 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-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 | Optimum Wound Profile |
| Optimystic | Opus | Opus '88 |
| Opus Dead | Opus III | Opus Int Music Ltd |
| Or-N-More | Ora | Ora, Rita |
| Orabge | 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 | 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, 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 |
| Orgy | Orianthi | Orielle |
| Oriental Wind | 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 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 |
| 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 | 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 | 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 |