For 10 points, name this composer of 4'33" (four minutes and thirty-three seconds).
Paul Zukofsky considered this man's Freeman Etudes unplayable. Merce Cunningham choreographed his ballet The Seasons, and he collaborated with his teacher Henry Cowell on Marriage at the Eiffel Tower. Several works by this man feature pieces of metal and glass positioned between the strings of a "prepared" piano. This composer's Imaginary Landscape series is an example of aleatoric music, and another work involves a pianist sitting quietly for the titular amount of time. For 10 points, name this composer of 4'33" (four minutes and thirty-three seconds).
Paul Zukofsky considered this man's Freeman Etudes unplayable.
John Cage