- 1 OneRepublic
- 2 One Direction
- 3 Oasis
- 4 Owl City
- 5 O-Zone
- 6 Odesza
- 7 Oh Wonder
- 8 Oh The Larceny
- 9 Of Monsters And Men
- 10 OK Go
- 11 Overground
- 12 Old Man Canyon
- 13 Orchestral Manoeuvres in the Dark
- 14 Orbital
- 15 of Montreal
- 16 Old Gods Of Asgard
- 17 Origen
- 18 One-T And Cool-T
- 19 Oneira
- 20 Outkast
- 21 Ofenbach
- 22 Our Lady Peace
- 23 Oceanlab
- 24 Ocean Colour Scene
- 25 Oh No! Oh My!
- 26 Obituary
- 27 O.A.R.
- 28 Oceana
- 29 Outloud
- 30 OtherView