O
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O'Connor, Mark
- O'Hara, Mary Margaret
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O'Riley, Christopher
- Oberlin, Russell
- Obraztsova, Elena
- Ohga, Norio
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Oistrakh, David
- Olejniczak, Janusz
- OperaBabes
- Oppitz, Gerhard
- Orchestra
- Orchestra "Classical Music Studio", St. Petersburg
- Orchestra "New Philharmony," St. Petersburg, Orchestra "New Philharmony," St. Petersburg
- Orchestra "New Philharmony" St. Petersburg,
- Orchestra del Maggio Musicale di Firenze,
- Orchestra del Teatro alla Scala
- Orchestra Filarmonica della Scala,
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Orchestra of St. Luke's,
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Orchestra Of The 18th Century
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Orchestra Of The Age Of Enlightenment
- Orchestra Of The Royal Opera House, Covent Garden
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Orchestra of Welsh National Opera,
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Orchestre De Paris
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Orchestre National De France
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Original Broadway Cast
- Original Cast,
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Original London Cast
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Orion String Quartet
- Orlovetsky, Alexei
- Ormandy, Eugene
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Orpheus Chamber Orchestra
- Osgood, Steven
- Osinska, Eva
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Oslo Philharmonic Orchestra
- Ottley, Dr. Jerold
- Ottman, John
- Ozawa, Seiji
