sentences:  There, he began to add his own songs into the scores of foreign operettas, notably Charles Lecocq's "The Pearl of Pekin", since these works had no effective copyright in the U.S.
  Kerker's first complete operetta in New York was "Castles in the Air" in 1890.He wrote over twenty shows, the most successful of which were the London musical burlesque "Little Christopher Columbus" (1893), and the international musical hit "The Belle of New York" (1897).Other notable musicals included "An American Beauty" (1896), "The Girl from Up There" (1901), "Winsome Winnie" (1903), "The Tourists" (1906), and "Fascinating Flora" (1907) to a book by R. H. Burnside and Joseph W. Herbert.