Former editor-in-chief of The Guardian and a keen amateur pianist, Alan Rusbridger's book “Play It Again” recounts how he learned Chopin’s Ballade No. 1 during a year bookended by Wikileaks and the News of the World phone-hacking scandal. Together with NYPL’s Paul Holdengraber, Rusbridger discusses music, the Pentagon Papers, and why he always carries a destroyed government hard drive in his breast pocket.