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 renowned American composer, has written an in-depth examination of the opera, drawing from the original vocal parts at the time of its debut. Noted critic Gabriel Josipovici has offered insights into the historical context that shaped the opera and its accompanying text.