Complete Listing of Artists
- Orquesta sinfonica de Madrid
- Orquesta y Coro del Palacio de Bellas Artes Mexico City
- Orquestra Sinfonica do Teatro Nacional de Sao Carlos, Lisboa
- Orsolini, Aldo
- Orthmann, Erich
- Ortiz, Christina
- Orton, Stephen
- Orval, Francis
- Osadchyy, Taras
- Osaka Philharmonic Orchestra
- Oslo Philharmonic Orchestra
- Osostowicz, Krysia
- Ostertag, Karl
- Otchando, Juan
- Otero, Juan Bautista
- Otter, Hans
- Ottevaere, Daniel
- Oudart, Felix
- Ovenden, Jeremy
- Owen, Handel
- Ozawa, Seiji
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