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