Nadia Boulanger's life spanned nearly a century, and at her death she was still director of the American School of Music at Fontainebleau, which she helped found after World War I. Enormously influential, she taught many distinguished performers and composers—among them Aaron Copland, Virgil Thomson, and Elliott Carter. She helped American music gain worldwide recognition. For this first full biography, Léonie Rosenstiel has drawn on papers and records to which Boulanger gave her unprecedented access and also on numerous interviews. The result is a rich portrait of an important woman of our time.