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