| Donny Osmond | Soundtrack | 1 |
| Outkast | RapR'n'BPop | 3 |
| Olivia Newton-John | SoundtrackPop | 3 |
| Ozzy Osbourne | Heavy metalHard rockRockBallad | 15 |
| Jacques Offenbach | Classic | 7 |
| Royal Philharmonic Orchestra | PopPop genreSoundtrack | 3 |
| Band of Horses | Alternative rock | 1 |
| Vains of Jenna | Rock | 2 |
| The Presidents of the United States of America | Rock | 1 |
| Kings of Leon | RockAlternative rock | 5 |
| ONINO | Pop | 2 |
| Max Oazo | Dance music | 1 |
