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