Note 66 — Chapter IV
Reading edition
"The two sonatas, which met with your special approval, are the only ones of this kind which I have ever composed. They are connected with the one in B minor, which I sent to you, with the one in B flat, which you now have also, and with two out of the Hafner-Würtemberg Collection; and all six were composed on a Claviacord with the short octave, at the Töplitz baths, when I was suffering from a severe attack of gout."
A series of six sonatas by E. Bach is in the Trésor des Pianistes, and is said to have been published at Nuremberg in 1744; the work is also dedicated to the Duke of Würtemberg, and the Opus number (2) is also given to it. There is mention of these sonatas in Bitter's biography of J.S. Bach's sons, but not of the others.