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