Colin Marshall talks to musicologist, writer, microtonal composer and educator Kyle Gann, author of No Such Thing as Silence: John Cage\u2019s 4\u203233\u2033. The former new music critic at the Village Voice, Gann turns his eye and ear in the book to Cage\u2019s most well-known composition, four minutes and 33 seconds in which no notes are played. Famous and infamous in equal measure, 4\u203233\u2033 has been variously considered a work of genius, a game-changing musical revelation and a charlatan\u2019s publicity stunt.