Arthur HONEGGER and Jacques IBERT. L'Aiglon. Musical drama in five acts. Poem by Edmond Rostand adapted by Henri Cain (Paris, Au Ménestrel, Heugel, 1937); folio, paperback (minor damage to spine). First edition of the vocal-piano score. Autograph signed letter from Jacques Ibert, also signed by Arthur Honegger, to singer Armand Narçon (1886-1944), who sang the role of Maréchal Marmont at the Opéra (September 1, 1937): à Monsieur Narçon avec notre vive reconnaissance pour sa belle création Jacques Ibert 1er Sept. 37. A. Honegger .