The American composer John Harbison has published an analysis of the opera (working from the vocal score), contemporary with its first performances. Gabriel Josipovici has commented on the historical events that inspired the opera and on the libretto itself.
John Harbison, a prominent American composer, has produced an analysis of the opera, based on the vocal score, in sync with its initial staging. Literary critic Gabriel Josipovici has discussed the events that influenced the creation of the opera and its script.