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 |
| 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 | Ocean | Ocean Colour Scene |
| Ocean Party, The | Ocean, Billy | Ocean, Humphrey |
| Oceanic | Oceansize | Ochil Players, The |
| Ochs, Phil | Ockeghem, Johannes | Octave One |
| Octavia | Octavian | 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 | 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 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 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 | 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 | 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 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 | Order, Bogus |
| 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 (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 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 (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 | Ozu, Masahiko | Ozzie Warlock And The Wizards |