- 1 Oh Wonder
- 2 Oasis
- 3 Other Lives
- 4 Ozomatli
- 5 OSLO
- 6 Orbital
- 7 Oliver Shanti & Friends
- 8 Odd Future
- 9 Outlawz
- 10 OGD
- 11 Oomloud
- 12 Orchestre Philharmonique de Radio France
- 13 Orchestral Manoeuvres in the Dark
- 14 OneRepublic
- 15 oneBYone
- 16 OZMA
- 17 Overmono
- 18 Orlando Vera Cruz
- 19 Otherkin
- 20 Ofenbach
- 21 Old Dominion
- 22 Otherwise
- 23 O.A.R.
- 24 Owls
- 25 Os Morenos
- 26 Origen
- 27 Otto Le Blanc
- 28 OK Band
- 29 Oneira
- 30 O.G.