| Olivier Tardy | 0 | 0 |
| Olivier Temime | 0 | 0 |
| Olivier Thiery | 2 | 0 |
| Olivier Thouin | 0 | 0 |
| Olivier Vernet | 19 | 0 |
| Oliviero Lacagnina | 1 | 0 |
| Oliviero de Fabritiis | 10 | 0 |
| Olle Persson | 5 | 0 |
| Olle Schill | 3 | 0 |
| Olli Ahvenlahti | 0 | 0 |
| Olli Heikkilän orkesteri | 1 | 0 |
| Olli Kortekangas | 3 | 0 |
| Olli Koskelin | 1 | 0 |
| Olli Mustonen | 40 | 0 |
| Olli Pohjola | 1 | 0 |
| Olli Virtaperko | 0 | 0 |
| Olli-Pekka Tuomisalo | 0 | 0 |
| Olli-Pekka Tuomisalo Orchestra | 0 | 0 |
| Ollie James | 0 | 0 |
| Ollie Marland | 0 | 0 |
| Olly James | 0 | 0 |
| Olodum | 0 | 0 |
| Olof Dreijer | 0 | 0 |
| Olof Höjer | 0 | 0 |
| Olof Larsson | 0 | 0 |
| Olof Melander | 6 | 0 |
| Olov Olofsson | 0 | 0 |
| Olshanoe | 0 | 0 |
| Oltremontano | 9 | 0 |
| Olya Dmytriw | 1 | 0 |
| Olympia Brass Band | 0 | 0 |
| Olympia Dukakis | 0 | 0 |
| Oláh Kálmán | 0 | 0 |
| Om Unit | 0 | 0 |
| Omar Acedo | 0 | 0 |
| Omar Bashir | 9 | 0 |
| Omar Ebrahim | 1 | 0 |
| Omar Enrique | 0 | 0 |
| Omar Faruk Tekbilek | 0 | 0 |
| Omar Massa | 1 | 0 |
| Omar Rudberg | 0 | 0 |
| Omar Sosa | 0 | 0 |
| Omar Thomas | 0 | 0 |
| Omar Zoboli | 0 | 0 |
| Omara Portuondo | 0 | 0 |
| Omasta | 0 | 0 |
| Omega One | 0 | 0 |
| OmenXIII | 20 | 0 |
| Omer Avital | 13 | 0 |
| Omer Benyamin | 0 | 0 |
| Omer Meir Wellber | 5 | 0 |
| Omertà | 0 | 0 |
| Omfeel | 0 | 0 |
| Omkar Verma | 0 | 0 |
| Omni Alien | 0 | 0 |
| Omnibadger | 0 | 0 |
| Omniphobe | 0 | 0 |
| Omo Bello | 0 | 0 |
| Omoi | 4 | 0 |
| Omri Hadari | 1 | 0 |
| Omri Shimron | 0 | 0 |
| Omroep Orkest | 0 | 0 |
| Omsk Philharmonic Orchestra | 0 | 0 |
| On Prism Records | 2 | 0 |
| On The Radar | 0 | 0 |
| On!Air!Library! | 0 | 0 |
| On-U Sound | 1 | 0 |
| Onaje Jordan | 0 | 0 |
| Ondrej Lenárd | 27 | 0 |
| Ondrej Lewit | 1 | 0 |
| Ondřej Adámek | 3 | 0 |
| Ondřej Havelka a jeho Melody Makers | 0 | 0 |
| Ondřej Kukal | 0 | 0 |
| Ondřej Macek | 0 | 0 |
| Ondřej Vrabec | 0 | 0 |
| One Last Day | 0 | 0 |
| One Man Army | 4 | 0 |
| One Man Nation | 0 | 0 |
| One Morning Left | 0 | 0 |
| OneRoom | 2 | 0 |
| Onelia Fineschi | 0 | 0 |
| Ongo Trogodé | 1 | 0 |
| Onion Knight | 0 | 0 |
| Onix Chamber Orchestra | 0 | 0 |
| Onj | 0 | 0 |
| Onkel Kånkel & His Kånkelbär | 0 | 0 |
| Only The Righteous | 0 | 0 |
| Only Worms Left | 0 | 0 |
| Onlybino! | 0 | 0 |
| Onnen Bock | 0 | 0 |
| Onnyk | 4 | 0 |
| Onomeya | 0 | 0 |
| Onutė Gražinytė | 0 | 0 |
| Onutė Narbutaitė | 5 | 0 |
| Onyx Ali | 0 | 0 |
| Onyx Brass | 0 | 0 |
| Onésia Rithner | 0 | 0 |
| Oodaredevil | 0 | 0 |
| Oodelally | 0 | 0 |
| Ookazi | 0 | 0 |