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| Ó Riada, Seán | 1931 - 1971 | Irish
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| O'Neill, Norman | 1875 - 1934 | English
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| Oakeley, Sir Herbert | 1830 - 1903 | English
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| Oberthür, Charles | 1819 - 1895 | German
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| Obradovic, Aleksandar | 1927 - | Yugoslav
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| Obrecht, Jacob | c1450 - 1505 | Netherlandish
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| Obukhov, Nikolay | 1892 - 1954 | Russian
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| Ockeghem, Johannes | c1410 - 1497 | Franco-Flemish
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| Offenbach, Jacques | 1819 - 1880 | French
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| Ohana, Maurice | 1914 - 1992 | French
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| Olah, Tiberiu | 1928 - | Romanian
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| Oldham, Arthur | 1926 - | English
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| Oliver, Stephen | 1950 - 1992 | English
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| Oliveros, Pauline | 1932 - | American
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| Olsen, Poul Rovsing | 1922 - 1982 | Danish
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| Olsson, Otto | 1879 - 1964 | Swedish
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| Ondrícek, Frantisek | 1857 - 1922 | Czech
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| Onslow, George | 1784 - 1853 | French
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| Orbón, Julián | 1925 - | Cuban
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| Ordonez, Carlo d' | 1734 - 1786 | Austrian
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| Orefice, Antonio | fl. 1708 - 1734 | Italian
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| Orefice, Giacomo | 1865 - 1922 | Italian
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| Orejón y Aparicio, José de | 1706 - 1765 | Peruvian
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| Orff, Carl | 1895 - 1982 | German
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| Orgad, Ben-Zion | 1926 - | Israeli
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| Orlandini, Giuseppe Maria | 1675 - 1760 | Italian
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| Ornstein, Leo | 1892 - | American
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| Orologio, Alessandro | c1550 - ?1633 | Italian
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| Orr, C. W. | 1893 - 1976 | English
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| Orr, Robin | 1909 - | Scottish
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| Orrego-Salas, Juan | 1919 - | Chilean
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| Ortiz, Diego | c1510 - c1570 | Spanish
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| Orto, Marbrianus de | c1460 - 1529 | Franco-Flemish
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| Osborne, George Alexander | 1806 - 1893 | Irish
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| Osborne, Nigel | 1948 - | English
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| Ostricil, Otakar | 1879 - 1935 | Czech
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| Oswald von Wolkenstein | c1377 - 1445 | German
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| Oswald, James | 1711 - 1769 | Scottish
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| Otaño, Nemesio | 1880 - 1956 | Spanish
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| Otescu, Ion Nonna | 1888 - 1940 | Romanian
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| Othmayr, Caspar | 1515 - 1553 | German
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| Ottani, Bernardo | 1736 - 1827 | Italian
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| Otto, Georg | 1550 - 1618 | German
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| Ouseley, Sir Frederick Arthur Gore | 1825 - 1889 | English
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| Overton, Hall | 1920 - 1972 | American
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| Ozi, Etienne | 1754 - 1813 | French
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