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| Porträt von Otto Singer (* 26. Juli 1833 in Sora, heute zu Wilthen; † 3. Januar 1894 in New York City).| https://archive.org/details/hundredyearsofmu00math/page/444/mode/2up/| Portrait of Otto Singer (I). Source: W.S.B. Mathews, ed. A Hundred Years of Music in America: An Account of Musical Effort in America(Chicago: G.L. Howe, 1889. Reprinted, Philadelphia: Theodore Presser, 1900).| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Otto Singer 1833-1894.jpg
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