Mozart’s elder sister had French director René Féret wonder: what if Maria Anna Walburga Ignatia, affectionately called Nannerl, been as gifted a musician as her younger brother, Wolfgang Amadeus? A product of her time—second half of the eighteenth century—she grew up on music as did her entire family, goaded by the formidable Leopold Mozart. She played the harpsichord, the piano, and almost certainly the violin. She probably sang. Mozart’s letters