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'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, 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 |
| Oattes Van Schaik | Obelisk | Obernik, Sam |
| Oberst, Conor | Obey The Brave | OBF |
| Obi | Obie Trice | Obituary |
| Objayda | Obliveon | Obraztsova, Elena |
| Obsession | Obus | Ocasek, Ric |
| Occasion, The | Occasional Few, The | Occasional Five, The |
| Occasional Project, The | Ocean | Ocean Colour Scene |
| Ocean, Billy | Ocean, Humphrey | Oceanic |
| Oceansize | Ochil Players, The | Ochs, Phil |
| Ockeghem, Johannes | Octave One | Octavia |
| October Country | October, Gene | Octopus |
| Odd Man Out | Oddie, Bill | Odds & Ends |
| Odell, Tom | Odetta | Odin |
| Odnoposoff, Ricardo | Odrich, Ron | Odyssey |
| Odyssey | Odyssey, The | Of Arrowe Hill |
| 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 |
| 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 | OK Go | OK Jive |
| Okay Temiz | Okereke, Kele | Okino, Shuya |
| Okino, Yoshihiro | Okkervil River | Okosun, Sonny |
| Ol Dirty Bastard | Oladimeji & His Talking Drum | 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 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 | 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 |
| Omar | Omar And The Howlers | Omarion |
| Omartian, Michael | Omartian, Michael And Stormie | OMC |
| Omega | Omega Amoeba | Omega Tribe |
| Omen | Omen III | Omerta |
| Omni Trio | Omowura, Ayinla | Omsk Russian Ensemble, The |
| On Offs, The | 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 |
| OneRepublic | Ones, The | OneTwo |
| Ong, Olivia | Onionhead | Only Child |
| Only If You Call Me Jonathan | Only Lonely | Only Ones |
| Ono, Kim | Ono, Seigen | Ono, Yoko |
| Onono, Ben | Onset, The | Onslaught |
| Onuora, Oku | Onward International | Onyeabor, William |
| Onyeka The Torch | Onyx | Onyx, The |
| Ooberman | Oomph | Oosterhuis, Trijntje |
| Oozay | Opa | Opal |
| Opal Butterfly | Opaz | OPE |
| 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 Dead |
| Opus III | Opus Int Music Ltd | Or-N-More |
| Ora | Ora, Rita | Orabge |
| Oral Exciters, The | 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 |
| Ordinary Boys, The | Ordinary Man | Oregon |
| Orellana, Raúl | 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 | 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 | 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 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 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, The | Other People |
| Other Two, The | Othermothers, The | Others [1960S], The |
| Otherwise | Otis & The King Pins | Otis Johnny |
| Otis Williams And His Charms | 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 Heaven |
| Our Kid | Our Lady Peace | Our Lunar Activities |
| Our Tribe | Ousset, Cécile | Out Of My Hair |
| Out Of The Blue | Out Of Your Mouth | Out With Mummy |
| Out, Papercut | Out-Phaze | Outcasts |
| Outcry Collective | Outer Limits | Outer Limits, The |
| Outfield | Outhere Brothers, The | Outkast |
| Outlander | Outlandish | Outlaw Blues Band, The |
| 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 |
| Overdraft, The | Overkill | Overlanders, The |
| Overload, Honcho | Overlord | 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 |
| Ozzie Warlock And The Wizards |