| # Tabulaturi | # Cereri | |
|---|---|---|
| O-zone | 16 | 3 |
| Oaia Neagră | 1 | |
| Oana Hanganu | 3 | |
| Oana Radu | 2 | |
| Oana Sârbu | 2 | 4 |
| Ocru | 5 | |
| Ocsi Baranyi | 1 | |
| Octave | 1 | 1 |
| Octavian Bud | 22 | |
| Octavian Lazăr | 7 | 4 |
| Odeon | 2 | 1 |
| Odyssey | 30 | 9 |
| Ofelia Rauh | 2 | 1 |
| Office Boys | 1 | |
| Old Black's | 1 | |
| Olga Bruja | 1 | |
| Olga Drăghici | 1 | |
| Olia Tira | 1 | |
| Oliver | 2 | 2 |
| Olivia Addams | 3 | |
| om la lună | 10 | 4 |
| Ombladon | 2 | 6 |
| Ombladon & Guess Who | 1 | |
| Omul cu Șobolani | 50 | 14 |
| ONE | 2 | |
| One Step | 1 | |
| Orchestra "Lăutarii" | 1 | |
| Orfeu | 1 | |
| Orizont 77 | 13 | |
| Ortodox | 2 | |
| Otilia | 1 | |
| Otto Pascal | 2 | 4 |
| Outsiders | 1 | |
| Ovi feat. Jo | 1 | |
| Ovidiu Haidu | 3 | |
| Ovidiu Iuliu Moldovan | 1 | |
| Ovidiu Komornyik | 6 | 3 |
| Ovidiu Lipan Țăndărică | 1 | |
| Ovidiu Liteanu | 2 | 7 |
| Ovidiu Mihăilescu | 20 | 11 |
| Ovidiu Niculescu | 9 | 1 |
| Ovidiu Rusu | 2 | 2 |
| Ovidiu Scridon | 15 | 3 |