O   | O Fracas | O Level |
| O Suilleabhain, Micheal | O Toole, Peter | O'Banion, John |
| O'Brien, Conan | 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'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.D, Adrenalin | 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 | Obernik, Sam | Oberst, Conor |
| OBF | Obi | Obie Trice |
| Obituary | Objayda | Obliveon |
| Obraztsova, Elena | Obsession | Obus |
| Ocasek, Ric | Occasion, The | Occasional Few, 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 | Odell, Tom |
| Odetta | Odin | 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 |
| 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 | 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, Sy |
| Oliveri, Nick | Olivia De Havilland | Olivia Tremor Control, The |
| Olivier, Laurence | Olivor, Jane | Ollie & Jerry |
| 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 | Omsk Russian Ensemble, The | On Offs, The |
| On The Seventh Day | On The Speakers | On/Off |
| Once Again | Once Blue | Onda Del Futuro |
| One | One 2 Many | One Day As A Lion |
| One Dove | 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, Act | One, Arkestra | One, As |
| One-Eyed Jacks | Oneida | Onelinedrawing |
| Oneness Of Juju | OneRepublic | 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 |
| Onward International | Onyeabor, William | 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 | 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 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 |
| Orchestra Baobab | Orchestra Filarmonica Di Roma | Orchestra Folklore Di Romagna |
| Orchestra Luna | Orchestra Makassy | 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, Raul |
| Orff, Carl | Orford, Martin | Organ, The |
| Organisation | 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 |
| 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 | Oryema, Geoffrey | Orzabal, Roland |
| 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 | 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, Shuggie | Ottawan |
| Ottewell, Ben | Otway & Barrett | Otway John |
| Ou Est Le Swimming Pool | 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 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, The | Outfield |
| Outhere Brothers, The | Outkast | Outlander |
| Outlandish | Outlaw Blues Band, The | Outlaws, The (UK) |
| Outlaws, The (US) | Outloud | Outnumbered, The |
| Outpatience, The | 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 | 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, 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 |
| Oysterhead | Oyuugi Wagamama Dan X PaRADEiS | OZ Magazine |
| Ozark Mountain Daredevils, The | Ozo | Ozomatli |
| Ozone | Ozone, Makoto | Ozric Tentacles |
| Ozzie Warlock And The Wizards |