"The Pearl Fishers' Duet" is a famous libretto from the opera Les pêcheurs de perles, by which French composer?
Au fond du temple saint: "Au fond du temple saint " ("At the back of the holy temple") is a duet from Georges Bizet's 1863 opera "Les pêcheurs de perles". Au fond du temple saint:  The libretto was written by Eugène Cormon and Michel Carré. Les pêcheurs de perles: Les pêcheurs de perles (The Pearl Fishers) is an opera in three acts by the French composer Georges Bizet, to a libretto by Eugène Cormon and Michel Carré.
Georges Bizet