A musical comedy duo most active in Britain during the 1950s and '60s, Michael Flanders (b. 1922) and Donald Swann (b. 1923) first met each other as schoolboys at Westminster in 1936. In 1939, the two collaborated on part of a musical revue titled Go for It, with Swann contributing piano and Flanders, an aspiring actor, appearing on-stage. They then served in the war -- Flanders in the Navy, and Swann as an ambulance driver -- during which Flanders contracted polio. It was to deprive him of a lung and leave him confined to a wheelchair for the rest of his life. They reconvened...