- 1 Opia
- 2 Our Last Night
- 3 Orbital
- 4 ON AN ON
- 5 Of Mice & Men
- 6 Oceanlab
- 7 OBB
- 8 One Nation
- 9 Oh Wonder
- 10 Orchester der Deutschen Oper Berlin
- 11 Orchestra of the Swan
- 12 OZMA
- 13 OneRepublic
- 14 oneBYone
- 15 Orchestre Philharmonique de Radio France
- 16 Orchestral Manoeuvres in the Dark
- 17 Outlawz
- 18 OK Go
- 19 Onyx
- 20 O.A.R.
- 21 Odesza
- 22 Old Dominion
- 23 Outloud
- 24 Oliver Shanti & Friends
- 25 Omnia
- 26 Otto Le Blanc
- 27 Ours
- 28 Opposite The Other
- 29 Ofenbach
- 30 Os Quatro e Meia