- 1 OneRepublic
- 2 Owl City
- 3 Oasis
- 4 One Direction
- 5 OK Go
- 6 O-Zone
- 7 Oh Wonder
- 8 Oh The Larceny
- 9 Odesza
- 10 Onyx
- 11 Of Monsters And Men
- 12 Outkast
- 13 Odd Mob
- 14 O-Town
- 15 Otep
- 16 Origen
- 17 Otros Aires
- 18 Old Dominion
- 19 Orchestral Manoeuvres in the Dark
- 20 ONUKA
- 21 Old Crow Medicine Show
- 22 Our Last Night
- 23 One-T And Cool-T
- 24 Oneira
- 25 Old Gods Of Asgard
- 26 Oomph!
- 27 Ofenbach
- 28 Overground
- 29 Orbital
- 30 Our Lady Peace