''''Ernst Krenek''' (August 23, 1900December 22, 1991) was an Austrian, later American, composer of Czech origin. He explored atonality and other modern styles and wrote a number of books, including ''Music Here and Now'' (1939), a study of Johannes Ockeghem (1953), and ''Horizons Circled: Reflections on my Music'' (1974). Krenek wrote two pieces using the pseudonym Thornton Winsloe.