| Orquesta Sinfónica de la Región de Murcia |
| Orquesta Sinfónica de Sevilla |
| Orquesta Sinfónica Naçional |
| Orquesta Sinfónica Nacional De Colombia |
| Orquesta Todos Estrellas |
| Orquesta Unión Filarmónica |
| Orquestra Harmônicas De Curitiba |
| Orquestra Mahatma |
| Orquestra Metropolitana |
| Orquestra Rio De Janeiro |
| Orquestra Sinfônica Do Estado De São Paulo |
| Orquídea Negra |
| Orr, Cindy |
| Orrall & Wright |
| Orriel Smith |
| Orrin Bolton |
| Orrin Evans |
| Orrin Hatch |
| Orrin Star |
| Orrin Tucker |
| Orrin Tucker & His Orchestra |
| Orrin Tucker & His Saxophone Orchestra |
| Orris |
| Orschinghis Khan |
| Orson |
| Orson Bean |
| Orson Welles |
| Orties |
| Ortiz, Jo-Elle |
| Ortiz, Monica Quello |
| Ortiz, Mostro Quello |
| Orton, Randy |
| Orup |
| Orville Couch |
| Orville Johnson |
| Orwell |
| Os Arrais |
| Os Canabais |
| Os Cariocas |
| Os Cretinos |
| Os Gatos |
| Os Hawaianos |
| Os Ímpares |
| Os Imperfeitos |
| Os Infernais |
| Os Morenos |
| Os Mutantes |
| Os Novos Baianos |
| Os Originais Do Samba |
| Os Paralamas |
| Os Paralamas do Sucesso |
| Os Travessos |
| Osaka Popstar |
| Osamu Kitajima |
| Osamu Koike |
| Osborne & Giles |
| Osborne Brothers |
| Osborne, Georga |
| Osborne, Jeffery |
| Osborne, Tony & His Orchestra |
| Osborne, Tony & His Orchestra & The Beryl Stott Chrous |
| Osbourne, Joan |
| Osbourne, Tony |
| Osbourne, Tony & His Orchestra |
| Oscar |
| Oscar "Papa" Celestin |
| Oscar Alemán |
| Oscar Alemán Y Los Cinco Caballeros |
| Oscar and the Wolf |
| Oscar Anderle |
| Oscar Andrade |
| Oscar Athie |
| Oscar Benito |
| Oscar Benton |
| Oscar Brand |
| Oscar Brown, Jr. |
| Oscar Castro-Neves |
| Oscar Castro?Neves |
| Oscar Chávez |
| Oscar Cortez |
