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O'Carolan, Turlough (27)
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O'Connor, Mark (25)
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O'Regan, Tarik (8)
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Obradors, Fernando J. (30)
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Obrecht, Jacob (39)
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Ockeghem, Johannes (78)
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Offenbach, Jacques (579)
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Ohana, Maurice (24)
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Olafsson, Kjartan (7)
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Olcott, Chauncey (8)
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Oldham, Kevin (6)
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Oliveros, Pauline (23)
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Olsson, Otto Emanuel (21)
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Onslow, Georges (23)
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Orbán, György (7)
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Orbón, Julian (10)
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Ord, Boris (24)
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Orff, Carl (183)
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Ornstein, Leo (15)
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Orrego-Salas, Juan (7)
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Ortiz, Diego (53)
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Osiander, Lucas (7)
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Oswald von Wolkenstein (15)
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Oswald, Henrique (6)
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Oswald, James (10)
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Othmayr, Caspar (8)
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Ott, David (8)
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Ouseley, F.A. Gore, Sir (8)
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Ovalle, Jaime (14)
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Overton, David (6)
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