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