| O |
| O |
| O A M Trio |
| O Level |
| O Melhor da Banda Eva |
| O Rappa |
| O Rei Do Gado |
| O Zone |
| O'G3NE |
| O' Donnell, Daniel |
| O' Yaba |
| O'2L |
| O'Banion, Sammy & Mardi Gras |
| O'Brien, Joan |
| O'Brien, Molly |
| O'Bryan |
| O'Callaghan, John |
| O'Callahan, Patricia |
| O'Carroll, Mike |
| O'Chi Brown |
| O'Connell |
| O'Connor, Des |
| O'Connor, Grace |
| O'Connor, Pat |
| O'Connor, Sinéad |
| O'Connor, Sinead & The Band |
| O'Connor, Steve Trio |
| O'Death |
| O'Dell |
| O'Donel Levy |
| O'Donnells |
| O'Donoghue |
| O'Donovan, Gillian |
| O'Dowd, Barry & The Shamrock Singers |
| O'Dowd, George |
| O'Farrill, Chico Afro-Cuban Jazz Orchestra |
| O'Hara's Playboys |
| O'Hara, Husk |
| O'Hara, Paige (Final) |
| O'Heller Project |
| O'Kobbo |
| O'Landa Draper's Associates |
| O'Malley, J Pat & Disney Studio Chorus |
| O'Malley, Kerry |
| O'Malley, Leondra |
| O'Malley, Mark |
| O'neal jamie |
| O'Neal, Zelma |
| O'Neil |
| O'Neil, Melissa |
| O'Neill |
| O'Neill |
| O'questrada |
| O'Roark Brothers |
| O'Rourke, David |
| O'Ryan |
| O'Shea Jackson |
| O'So Krispie |
| O'sullivan gilbert |
| O'Sullivan, Diane |
| O'Sullivan, Maureen |
| O'Tool, Timmy |
| O'Town Boyz |
| O'Yaba |
| O+S |
| O-1 |
| O-Dash |
| O-Dog |
| O-Mega |
| O-Shen |
| O-Tones |
| O-town |
| O-Zone |
| O. C. Smith |
| O. from Da Block |
| O. Torvald |
| O., Cynthia |
| O., Janis |
| O.A.R. |
| O.B. Buchana |
