Philip Glass, who is recognised as one of the leading proponents of minimalism in the world today, has written over twenty-five operas, a total achieved by hardly any composer since the days of Rossini, Donizetti and Verdi. Three of these form the ‘portrait trilogy’, which focuses on pivotal figures in the fields of science, politics and religion respectively. Einstein on the Beach premiered in 1976, Satyagraha (about Mahatma Gandhi) followed in 1980, and then the triptych was...