DONIZETTI, Gaetano (1797-1848). Autograph letter signed ("Donizetti'), in French, to M. Mauroy. Paris, 8 August 1843. 1 page, 8vo, creased at folds. Written in haste, Donizetti announces the start of rehearsals for his opera Dom Sebastien: "Now you are coming to lunch with me, after that you can go about your business, and I go to the first rehearsal of my Sebastien."