 The music for the overture/opening chorus for the opera "Amore et  Gloire" (in which Christine makes her debut as lead soprano,  standing in for the drugged Biancarlotti) is actually  Frédéric Chopin (qv)s "Military Polonaise." The music for  Christines aria/duet with Anatole (in the same opera) is actually  Chopins famous Nocturne in E Flat Major.