Hammerstein, Oscar (hămˈərstĪn) [key], 1846–1919, German-American operatic impresario. In 1888 he built the Harlem Opera House, and in 1906 the Manhattan Opera House, where he gave noteworthy productions. He brought many fine singers to the United States, and introduced Louise, Pelléas et Mélisande, and Elektra to the American public. In 1910 the Metropolitan Opera Company bought his interests. Upon the failure (1913) of an operatic venture in London, he returned to New York and built the Lexington Theater, where he produced varied entertainments.
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