- 1 OneRepublic
- 2 One Direction
- 3 Oasis
- 4 Owl City
- 5 O-Zone
- 6 One Voice
- 7 Oh Wonder
- 8 Oh The Larceny
- 9 Odesza
- 10 One-T And Cool-T
- 11 Of Monsters And Men
- 12 Overground
- 13 Ofenbach
- 14 Outkast
- 15 Our Lady Peace
- 16 Oceanlab
- 17 Ocean Colour Scene
- 18 Oh No! Oh My!
- 19 Obituary
- 20 O.A.R.
- 21 Oceana
- 22 Outloud
- 23 Orbital
- 24 of Montreal
- 25 Ozomatli
- 26 OZMA
- 27 Our Last Night
- 28 O-Town
- 29 Outlawz
- 30 Orchestre de la Suisse Romande