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