| | - O
- of Montreal
- Ola Gjeilo
- Olafur Arnalds
- Olafur Arnalds & Alice Sara Ott
- Olafur Arnalds & Nils Frahm
- Olga Anna Markowska
- Olga Pashchenko
- Olga Scheps
- Olivia Belli
- Olivia Pedroli
- Omnia
- One More Time
| - One Voice Children's Choir
- Oneohtrix Point Never
- Oonagh
- OperaBabes
- Operatica
- Ophelie Gaillard & Pulcinella Orchestra
- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
- Orchestra and Chorus of La Scala, Carlo Sabajno
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- Orchestra del Teatro alla Scala di Milano & Claudio Abbado
- Orchestra dell'Accademia Nazionale di Santa Cecilia, Antonio Pappano
| - Orchestra of the Swan
- Orchestral Manoeuvres in the Dark
- Orchestre de l'Opera de Paris, Pierre Boulez
- Oren Ambarchi
- ORF Vienna Radio Symphony Orchestra & John Jeter
- Ornette Coleman
- Otmar Suitner, Staatskapelle Berlin
- OTTA-Orchestra
- Otto Klemperer
- Otto Klemperer, New Philharmonia Orchestra
- Otto Klemperer, Philharmonia Orchestra, Elisabeth Schwarzkopf
- Otto Klemperer, Wiener Philharmoniker
- Oval
- Owen Pallett
- The Olivia Tremor Control
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