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