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