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