The correspondence includes letters from Georges Bizet's widow, Mme Geneviève Strauss (better known as the original of Proust's Mme de Guermantes), and from others who had known Bizet, and after the publication of the book, from people who asked him for advice. It also includes correspondence with Felix Weingartner and other material concerning the discovery by D C Parker of Bizet's Symphony in C.