- 1 OneRepublic
- 2 One Direction
- 3 Oasis
- 4 Owl City
- 5 O-Zone
- 6 Oh Wonder
- 7 OK Go
- 8 One Voice
- 9 Oh The Larceny
- 10 Outkast
- 11 Odesza
- 12 Otros Aires
- 13 Outlandish
- 14 One-T And Cool-T
- 15 Opeth
- 16 Overground
- 17 Of Monsters And Men
- 18 Origen
- 19 Old 97's
- 20 Oceanlab
- 21 of Montreal
- 22 O-Town
- 23 Orchestral Manoeuvres in the Dark
- 24 Old Gods Of Asgard
- 25 ONUKA
- 26 Our Last Night
- 27 Ofenbach
- 28 Our Lady Peace
- 29 Ocean Colour Scene
- 30 Oh No! Oh My!