| O'Connor, John |
| O'Connor, Sinéad |
| O'Flynn |
| O'Malley, Stephen |
| O'Neil, Tara Jane |
| O'RIORDAN, Dolores |
| O'Rourke, Jim |
| O.S.T. |
| OASIS |
| OBEL, Agnes |
| Object (Lawrence English) |
| OCEÁN |
| Octo Octa |
| Odd Nosdam |
| Odell, Tom |
| Odesza |
| Ofarim, Esther |
| Offenbach, Jacques |
| Offshore |
| Ogada, Ayub |
| Ohm Square |
| OLAFSSON, Vikingur |
| Oldfield, Mike |
| Oldfield, Terry |
| OLIVERAY (Peter Broderick & Nils Frahm) |
| Oliveros, Pauline |
| Olmerová, Eva |
| OLSEN, Angel |
| Olympic |
| Om |
| OMD (Orchestral Manoeuvres in the Dark) |
| Omenya |
| Onda Vaga |
| One Self (DJ Vadim) |
| Oneida |
| Oneohtrix Point Never |
| Ono, Seigen |
| Onyx Collective |
| Oöphoi |
| Oosterhuis, Trijntje |
| Opia |
| Opium |
| Opsvik & Jennings |
| Optina Pustyn Male Choir |
| Orb, The |
| ORB, The / FENIN / BUS |
| ORBIT, William |
| ORBITAL |
| Orchester ľudových nástrojov (OĽUN) |
| Orff, Carl |
| Ori, Viktor |
| Origami Galaktika |
| Origami Galaktika / I:Wound / Inderst Elia |
| Original Memphis Five/Benny Goodman/Lead Belly/A.O. |
| Orkesta Mendoza |
| Orloj snivců |
| Ortolani, Riz |
| Orvar Smarason |
| Osbourne, Ozzy |
| OSPALÝ POHYB |
| Otava Jo (Otava Yo) |
| Other Two, The |
| Otras / Julo Fujak |
| Ott, Alice Sara |
| Ottone Pesante |
| Overmono |
| OY |
| O’Flynn x Frazer Ray |
| O’Halloran, Dustin |
