“Those who keep their culture in tidy boxes have a problem with Stephen Sondheim. For 47 years, ever since he jetted to attention at 27 as lyricist of West Side Story, Sondheim has walked both sides of the track and straight down the middle. He plays in commercial theatres and state opera houses, in am-dram and at the Kennedy Center. All his life he has defied categorisation as high art or low, common entertainer or lofty public edifier.”