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Artists: O'Conor - Orchestre National de la Radiodiffusion Française
- O'Conor, John (piano)
- O'Day, Anita (vocals)
- O'Dette, Paul (lute)
- O'Donnell, John (organ)
- O'Neill, Simon (tenor)
- O'Reilly, Graham (conductor)
- O'Rourke, Miceál (piano)
- O’Donnell, James (conductor)
- O’Hara, Ronan (piano)
- O’Neill, Dennis (tenor)
- Oberlin, Russell (counter-tenor)
- Oberlinger, Dorothee (recorder)
- Obraztsova, Elena (mezzo-soprano)
- Odense Symphony Orchestra (orchestra)
- Odhecaton (early music ensemble)
- Oelze, Christiane (soprano)
- Ogawa, Noriko (piano)
- Ogden, Craig (guitar)
- Ogdon, John (piano)
- Ogg, Jacques (early keyboard instruments)
- Ogrintchouk, Alexei (oboe)
- Ohlsson, Garrick (piano)
- Oistrakh, David (violin)
- Oistrakh, Igor (violin)
- Oke, Alan (tenor)
- Olbertz, Walter (piano)
- Olejniczak, Janusz (piano)
- Olevsky, Julian (violin)
- Olivero, Magda (soprano)
- Ollé, Àlex (stage director)
- Ollila, Tuomas (conductor)
- Oncina, Juan (tenor)
- Onyx Brass (brass ensemble)
- Oortmerssen, Jacques van (organ)
- Oosten, Ben van (organ)
- Oper Frankfurt (opera company)
- Opéra National de Lyon (opera company)
- Opéra national de Paris (opera company)
- Opera North (opera company)
- Opernhaus Zürich (opera company)
- Opie, Alan (baritone)
- Opium String Quartet (string quartet)
- Opolais, Kristine (soprano)
- Oppitz, Gerhard (piano)
- ORA (choir)
- Oramo, Sakari (conductor)
- Orbelian, Constantine (conductor)
- Orchestra da camera Ferruccio Busoni (orchestra)
- Orchestra del Teatro Comunale di Bologna (orchestra)
- Orchestra del Teatro Regio di Torino (orchestra)
- Orchestra dell'Accademia Nazionale di Santa Cecilia (orchestra)
- Orchestra della Svizzera Italiana (orchestra)
- Orchestra di Padova e del Veneto (orchestra)
- Orchestra La Scintilla (orchestra)
- Orchestra Mozart (orchestra)
- Orchestra of St. John's Smith Square (orchestra)
- Orchestra Of St. Luke's (orchestra)
- Orchestra of the 18th Century (orchestra)
- Orchestra of the Age of Enlightenment (orchestra)
- Orchestra of the Swan (orchestra)
- Orchestra Sinfonica di Milano della RAI (orchestra)
- Orchestra Sinfonica di Milano Giuseppe Verdi (orchestra)
- Orchestra Sinfonica di Roma della RAI (orchestra)
- Orchestra Sinfonica di Torino della RAI (orchestra)
- Orchestre de Bretagne (orchestra)
- Orchestre de Chambre de Jean-François Paillard (orchestra)
- Orchestre de Chambre de Lausanne (orchestra)
- Orchestre de Chambre de Paris (orchestra)
- Orchestre de Chambre Jean-Francois Paillard (orchestra)
- Orchestre de la Suisse Romande (orchestra)
- Orchestre de Paris (orchestra)
- Orchestre des Champs Elysées (orchestra)
- Orchestre des Champs-Élysées (orchestra)
- Orchestre des Concerts Lamoureux (orchestra)
- Orchestre du Capitole de Toulouse (orchestra)
- Orchestre Métropolitain (orchestra)
- Orchestre National Bordeaux Aquitaine (orchestra)
- Orchestre National de Bordeaux Aquitaine (orchestra)
- Orchestre National de France (orchestra)
- Orchestre National de la Radiodiffusion Française (orchestra)
Artists: Orchestre National de Lille - Ozawa
- Orchestre National de Lille (orchestra)
- Orchestre National de Lyon (orchestra)
- Orchestre National de Montpellier Languedoc-Roussillon (orchestra)
- Orchestre Philharmonique de Liège (orchestra)
- Orchestre Philharmonique de Monte-Carlo (orchestra)
- Orchestre Philharmonique de Radio France (orchestra)
- Orchestre Révolutionnaire et Romantique (orchestra)
- Orchestre Symphonique de Quebec (orchestra)
- Oren, Daniel (conductor)
- Orendt, Gyula (baritone)
- Orfeo 55 (early music ensemble)
- Orford String Quartet (string quartet)
- Orgonasova, Luba (soprano)
- Orkis, Lambert (piano)
- Orlando Consort (early music ensemble)
- Orlov, Alexander (conductor)
- Ormandy, Eugene (conductor)
- Orozco-Estrada, Andrés (conductor)
- Orphei Drängar (choir)
- Orpheus Chamber Orchestra (orchestra)
- Orquesta Ciudad de Granada (orchestra)
- Orquesta de la Comunidad de Madrid (orchestra)
- Orquesta Filarmonica de Gran Canaria (orchestra)
- Orquesta Filarmónica de la Ciudad de México (orchestra)
- Orquestra de la Comunitat Valenciana (orchestra)
- Orquestra Simfònica de Barcelona I Nacional de Catalunya (orchestra)
- Ortega, Ginesa (mezzo-soprano)
- Ortiz, Cristina (piano)
- Osborn, John (tenor)
- Osborne, Steven (piano)
- Osipova, Natalia (dancer)
- Oslo Philharmonic Orchestra (orchestra)
- Ossonce, Jean-Yves (conductor)
- Ostrobothnian Chamber Orchestra (orchestra)
- Otaka, Tadaaki (conductor)
- Ott, Alice Sara (piano)
- Ottensamer, Andreas (clarinet)
- Ottensamer, Daniel (clarinet)
- Otter, Anne Sofie von (mezzo-soprano)
- Otterloo, Willem van (conductor)
- Otto, Lisa (soprano)
- Ouatu, Florin Cezar (counter-tenor)
- Oulu Symphony Orchestra (orchestra)
- Oundjian, Peter (conductor)
- Ousset, Cécile (piano)
- Ovcharenko, Artem (dancer)
- Ovenden, Jeremy (tenor)
- Owen, Charles (piano)
- Owens, Matthew (conductor)
- Owens, Eric (baritone)
- Oxalys (chamber ensemble)
- Oxford Bach Choir (choir)
- Oxford Camerata (choir)
- Oxford Girls' Choir (choir)
- Ozawa, Seiji (conductor)
