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