William Furst (b. 1867 - d. 1917) was an American composer and conductor known primarily for his contributions to early 20th-century American classical music and popular song. Furst’s music often blended elements of classical structure with popular melodies, which resonated with audiences of his time. His notable works include the operetta "The Firefly" (1912) and the popular song "The Girl Behind the Bar," which gained significant attention. Furst was also known for his work in musical theater and vaudeville, contributing to the evolving landscape of American entertainment. Furst's impact on music lies in his ability to bridge the gap between classical composition and popular song formats, helping to pave the way for future American composers. His work reflected the cultural shifts of his era, incorporating themes and styles that appealed to a broader audience. Although not as widely recognized today, Furst's contributions played a role in the development of American musical identity in the early 20th century, influencing the integration of classical and popular music genres.