| Donny Osmond | Soundtrack | 1 |
| Outkast | Rap/ Hip-HopR'n'BPop | 3 |
| Olivia Newton-John | SoundtrackPop | 3 |
| Ozzy Osbourne | SchwermetallHardrock RockBallade | 10 |
| Jacques Offenbach | Klassik | 7 |
| Royal Philharmonic Orchestra | Pop EstradaSoundtrack | 3 |
| Band of Horses | Alternative Musik / Alternative Rock | 1 |
| Vains of Jenna | Rock | 2 |
| The Presidents of the United States of America | Rock | 1 |
| Kings of Leon | RockAlternative Musik / Alternative Rock | 5 |
| ONINO | Pop | 2 |
| Max Oazo | Tanzmusik | 1 |
