Stephen Fry describes his delight and bewilderment at first hearing Conlon Nancarrow's Study No. 21 - also known as Canon X - for player piano. Nancarrow devoted his composing life to creating futuristic canonic studies for his custom-altered 1920s Ampico instrument, combining elements of jazz, Bach and Stravinsky, as we hear from the other voice in this episode, pianist Joanna MacGregor.