O   | O | O Fracas |
| O Level | O Rodney & Cooley Joe | 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'Cuthbert, Martin | O'Day, Alan | O'Day, Anita |
| O'Donnell Roger | O'Donnell, Al | O'Donnell, Alison |
| O'Donnell, Daniel | O'Donnell, Eugene | 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'Leary, Johnny |
| 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, Bernard |
| O'Sullivan, Daniel | O'Sullivan, Gilbert | O, Karen |
| O, Rob | O-Town | O. |
| O. J. Abbott | O. P. Nayyar | O.A.R (Of A Revolution) |
| O.C Roberts | O.C. | O.Children |
| O.D, Adrenalin | O.G.C. | O.M.D. |
| O.T. Quartet | O.T.T | Oak |
| Oak Ridge Boys, The | 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 | Oathbreaker | Oats, Wild |
| Oattes Van Schaik | Obassey, Patty | Obel, Agnes |
| Obelisk | Oberhofer | Oberlin, Russell |
| Obernik, Sam | Oberon | Oberst, Conor |
| Obey The Brave | Obey, Ebenezer | Obey, Trust |
| OBF | Obi | Obi, Ras |
| Obie Trice | Obituary | Objayda |
| Obliveon | Obraztsova, Elena | Obsequiae |
| Obsession | Obus | Ocasek, Ric |
| Occasion, The | Occasional Few, The | Occasional Five, The |
| Occasional Project, The | Occasionally David | Occult Burial |
| Ocean | Ocean (Modern Soul) | Ocean Colour Scene |
| Ocean Grove | Ocean Party, The | Ocean, Billy |
| Ocean, Humphrey | Oceanic | Oceano |
| Oceans Ate Alaska | Oceans Of Slumber | Oceansize |
| Ochil Players, The | Ochs, Phil | Ockeghem, Johannes |
| Octa, Octo | Octagon Man, The | Octave One |
| Octavia | Octavian | October Country |
| October Tide | October, Gene | Octopus |
| Octopus Syng | Oculus | Odd Man Out |
| Oddie, Bill | Odds & Ends | Odell, Tom |
| Odetta | Odin | Odnoposoff, Ricardo |
| Odrich, Ron | Odyssey | Odyssey |
| Odyssey, The | Of Arrowe Hill | Of Feather And Bone |
| Of Mice & Men | Of Monsters And Men | Of Montreal |
| Ofarim, Esther | Ofege | Off |
| Off The Wall | Off With Their Heads | OFF! |
| Off, Half | Off-Shore | Offenbach (Rock) |
| Offenbach, Jacques | Offhooks, The | Official Secrets, The |
| Offshore | Offspring | Ofshore |
| Ofwerman, Rune | Ogan, Gary & Lamb, Bill | Ogawa, Yusuke |
| 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 | Ohhms | 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 & Rostropovitch |
| Oïstrakh, David | Oïstrakh, David & Igor | Oïstrakh, Igor |
| Oizone | Ojo, Dele | OK Go |
| OK Jive | Okay Temiz | Okereke, Kele |
| Okino, Shuya | Okino, Yoshihiro | Okkervil River |
| Okkultokrati | Okosun, Sonny | Okumoto, Ryo |
| Ol Dirty Bastard | Oladimeji & His Talking Drum | Olatunji, Babatunde |
| Olausson, Jakob | Olavide, Begoña | Olay, Ruth |
| OLD | Old And In The Way | Old Crow Medicine Show |
| Old Fashioned Love | Old Gold | Old Man Gloom |
| 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 | Olney, Dave | Olney, David |
| 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 | Omegavortex |
| Omen | Omen III | Omen, Macabre |
| Omerta | Omi, Sonik | Omit |
| Omni | Omni Trio | Omnium Gatherum |
| Omori, Hinako | Omowura, Ayinla | Omsk Russian Ensemble, The |
| Omura, Kenji | On 1 Crew | On And Ons, The |
| On Offs, The | On Parole | On The Air |
| On The One | On The Seventh Day | On The Speakers |
| On Trial | On/Off | Once & Future Band |
| Once Again | Once Blue | Once Human |
| Onda Del Futuro | Ondolo, John | Ondskapt |
| One | One [AOR] | One 2 Many |
| One AM Radio, The | 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 Way System | One Way Ticket |
| One Word | One, Act | One, Arkestra |
| One, As | One, Bold | One-Eyed Jack |
| 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 |
| Only, Jerry | Ono, Kim | Ono, Seigen |
| Ono, Yoko | Onom Agemo & The Disco Jumpers | Onono, Ben |
| Onset, The | Onslaught | Onuora, Oku |
| Onward International | Onwenu, Onyeka | Onyeabor, William |
| Onyeka The Torch | Onyx | Onyx, The |
| Ooberman | Oomph | Oosterhuis, Trijntje |
| Oozay | Oozing Wound | Opa |
| Opal | Opal Butterfly | Opaz |
| OPE | Opel, Jackie | Open Book |
| Open Hand | Open In Obscurity | Open Mike Eagle |
| Open Mind, The | Open Road | Open Sky |
| Open, The | Operahouse | Operation Ivy |
| Operator Please | Operators, The | Opeth |
| Ophthalamia | Opium Lord | OPM |
| OPM (Disco) | Oporto | Opossom |
| Oppenheimer | Opposition | Opsahl & Lindstedt |
| Optic Eye | Optic Nerve, The | Optimist Club |
| Optimistas, Los | Optimum Wound Profile | Optimystic |
| Opus | Opus '88 | Opus [Rock] |
| Opus Dead | Opus III | Opus Int Music Ltd |
| Or-N-More | Ora | Ora, Rita |
| Orabge | Oraisòn, Jorge | Oral |
| Oral Exciters, The | Oram, Daphne | Orange (Shoegaze) |
| 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 | Oranssi Pazuzu |
| Orb | Orbidöig | Orbison, Joy |
| Orbison, Roy | Orbit, William | Orbital |
| Orbo Equitum Solis | Orca | Orcas |
| Orch. Of The Amsterdam Phil. | Orchard, Marble | 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, Apocalypse |
| Orchestra, Cardboard | Orchestra, Peace | Orchestra, Sauter-Finegan |
| Orchestre De L'Association | Orchestre De L'O.R.T.F. | Orchestre De La Suisse Romande |
| Orchestre De Monte Carlo | Orchestre De Paris | Orchestre Eddie Roger |
| Orchestre Jazira | Orchestre T.P.O.K. Jazz | Orchid |
| Orchid (DOOM) | Orchids (60S), The | Orchids, The |
| Orcustus | Ordeal, DJ | Order Of Apollyon, The |
| Order, Bogus | Order, Natural | Order, Outlaw |
| Ordinary Boys, The | Ordinary Man | Ordination Of Aaron |
| Oregon | Orellana, Raúl | Oren, Peter |
| Orexis | Orff, Carl | Orford, Martin |
| Organ, The | Organisation | Organisms |
| Organization | Organized Konfusion | Organum |
| Orgazmo | Orgone Box | Orgy |
| Orianthi | Orielle | Orielles, The |
| Orient Express | Oriental Wind | Origami Angel |
| Origin | Origin Unknown | Origin, The |
| Original Bedroom Rockers | Original Brasso Band, The | Original Cast Recording |
| Original Concept | Original Dixieland Jazz Band | Original DJ Vibes |
| 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 | Orleans, Ela | Orlons, The |
| Orme, Le | Ormonde Folk, The | Ornadel, Cyril |
| Ornament | Ornamental | Oroonies, The |
| Orozco, Rafael | Orphan | 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 | Orr, Buxton |
| Orr, Michael | Orrall, Robert Ellis | Orrico, Stacie |
| ORS | Orson | Orson Family, The |
| Ortega, Jeannie | Ortega, Lindi | Orthodox |
| Ortiz, Cristina | Ortolani, Riz | Orton, Beth |
| Orwell, Paul | Orwells, The | 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 |
| Osanna | 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 |
| Osiah | Osibisa | Osipov Academic Russian Folk O |
| Osiris (Funk) | Osiris (Prog) | Oskar, Lee |
| Oslin, K.T. | Oslo Philharmonic Orchestra | Osmond Boys |
| Osmond, Donny | Osmond, Jimmy | Osmond, Marie |
| Osmonds, The | Osmosis | Oso, Oso |
| Osorio, Jorge Federico | Ossian | Ossie & The Upsetters |
| Ossie Layne Show, The | Osterman Weekend, The | Ostrogoth |
| Osunlade | Osymyso | Otep |
| Other Half | Other Half, The | Other Ones (80S), The |
| Other Ones, The | Other People | Other Two, The |
| OTHERLiiNE | Othermothers, The | Others [1960S], The |
| Otherwise | Otis & The King Pins | Otis Johnny |
| Otis Williams And His Charms | Otis Williams And The Midnight Cowboys | Otis, Byron |
| Otis, Ed & Ben | Otis, Shuggie | Ottawan |
| Ottewell, Ben | OTTO | Otway & Barrett |
| Otway John | Ou Est Le Swimming Pool | Ouch |
| Ought | 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 Hollow Our Home |
| Our Kid | Our Lady Peace | Our Lunar Activities |
| Our Tribe | Ousset, Cécile | Out Cold |
| Out For Justice | Out Hud | Out Lines |
| Out Of Darkness | Out Of My Hair | Out Of The Blue |
| Out Of Your Mouth | Out On Blue Six | 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 | Outo |
| Outpatience, The | Outrage | Outrider |
| Outside | Outsiders (Punk), The | Outsiders, The |
| Outsiders, The | Outsiders, The | Outsiders, The (US) |
| Outskirts Of Infinity | Outskirts, The | Ov Sulfur |
| Ova | Oval | Ovary Lodge |
| Overall, Kassa | Overdraft, The | Overexposure |
| Overkill | Overlanders, The | Overload |
| Overload, Honcho | Overload, Shifty | Overlord |
| Overlord (Punk) | Overlords, The | Overmono |
| Override | Overstreet, Tommy | Overtones, The |
| Owen | Owen And Leon | Owen, Dylan |
| Owen, Mark | Owen, Michael | Owen, Nelson |
| Owen, Ray | Owen, Reg | Owen, Sid & Patty Palmer |
| Owens, Buck | Owens, Buck & Raye, Susan | Owens, Frank |
| Owens, Jack | Owens, Jamie | Owens, Jimmy |
| Owens, Robert | Owens, Tim 'Ripper' | Owens, Tony |
| Owl & Mouse | Owl Service, The | Owls |
| Owls, Fewer | Owston, Chuck | Oxbow |
| Oxfam Glamour Models | Oxford Nights, The | Oxford, Vernon |
| Oxide Neutrino | Oxley, Louie | Oxley, Tony |
| OXO | Oxxo Xoox | Oxy And The Morons |
| Oxygen Destroyer | Oxym | Oyster Band, The |
| Oysterband | Oysterhead | Oyuugi Wagamama Dan X PaRADEiS |
| OZ Magazine | Ozan, Mehmet | Ozark Mountain Daredevils, The |
| Ozo | Ozomatli | Ozone |
| Ozone, Makoto | Ozric Tentacles | Ozu, Masahiko |
| Ozzie Warlock And The Wizards |