59. See Pamela Fox, “Toward a Comprehensive C. P. E. Bach Chronology: Schrift-Chronologie and the Issue of Bach’s ‘Late Hand’,” in Carl Philipp Emanuel Bach: Musik für Europa, 306–323, esp. 319–320 and ex. 5A and 5B. The autograph of the sonata—Crakow, Biblioteka Jagiellónska, Mus. ms. Bach P 771—is a fascinating document, for it preserves the final page, crossed through, of the first movement that was sent to Breitkopf. And it preserves as well an actual sketch for the cadenza-like passage five bars before the end.