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