When Glyndebourne opened its doors for the first time in 1934, the work on the programme was Mozart’s Marriage of Figaro. Mozart was the only music performed throughout Glyndebourne’s first four seasons, and he is still the composer with whom Britain’s first and best-known “country house” opera festival is most associated. It was on a very different composer, however, that the gaze of the festival’s founder, John Christie, was initially trained. Christie was a Germanophile and obsessed with the work of Richard Wagner. “He was always hankering to do Parsifal at Glyndebourne as an Easter festival,” recalled his son, Sir...