- 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 Opeth
- 11 Orbital
- 12 Outkast
- 13 Origen
- 14 Our Last Night
- 15 One-T And Cool-T
- 16 Of Monsters And Men
- 17 Overground
- 18 Oomloud
- 19 Old Gods Of Asgard
- 20 O-Town
- 21 of Montreal
- 22 ONUKA
- 23 Overmono
- 24 Orchestral Manoeuvres in the Dark
- 25 Oomph!
- 26 Ofenbach
- 27 Oneira
- 28 Oceanlab
- 29 Otros Aires
- 30 Onyx