- 1 OneRepublic
- 2 One Direction
- 3 Oasis
- 4 Owl City
- 5 O-Zone
- 6 Oh Wonder
- 7 One-T And Cool-T
- 8 Odesza
- 9 OK Go
- 10 Oh The Larceny
- 11 Of Monsters And Men
- 12 Orbital
- 13 Overground
- 14 Orchestral Manoeuvres in the Dark
- 15 Onyx
- 16 Otherwise
- 17 Outkast
- 18 Oneira
- 19 Oesch's die Dritten
- 20 Ofenbach
- 21 Oomloud
- 22 ONUKA
- 23 Our Last Night
- 24 Old Gods Of Asgard
- 25 Origen
- 26 Old 97's
- 27 Oceanlab
- 28 Otros Aires
- 29 Our Lady Peace
- 30 Ocean Colour Scene