Oscar Greeley Clendenning Hammerstein II (pronounced /ˈhæmərstaɪn/; July 12, 1895 – August 23, 1960) was an American writer, theatrical producer, and (usually uncredited) theatre director of musicals for almost forty years. Hammerstein won eight Tony Awards and was twice awarded an Academy Award for "Best Original Song", and much of his work is part of the unofficial Great American Songbook. He wrote 850 songs.

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