- 1 Owsey
- 2 Orlando Voorn
- 3 Onyx Brass
- 4 Odetari
- 5 Outertone
- 6 OTM
- 7 Olja Karleusa
- 8 Olivier Messiaen
- 9 Ol' Dirty Bastard
- 10 Otis Redding
- 11 Ocean Waves for Sleep
- 12 OMFG
- 13 OsamaSon
- 14 Offline
- 15 OG Maco
- 16 ODIE
- 17 Ogryzek
- 18 OPlus
- 19 oofoe
- 20 Oscar And The Wolf
- 21 Oscar Yuan
- 22 Oscar Dunbar
- 23 Oyster
- 24 Oliver Green
- 25 OB1
- 26 Olaf Blackwood
- 27 Our Lady of Fatima Kongowea Catholic Choir
- 28 Olam
- 29 Ordonez
- 30 Omar Ruiz