Artist Tacita Dean on John Cage's legendary 4'33" and how it provided an inspiration for Stillness, her 2007 project with choreographer Merce Cunningham. Conductor and Cage collaborator Richard Bernas underlines some important but often neglected aspects of the score and draws a parallel with the visual arts scene of 1950s New York. And we hear the voice of the composer himself from a 1970s BBC interview with critic Frank Kermode.