Klavierstück in F, K.33b, composed in Zurich, beginning of October 1766 Although the composition is not dated, time and place become clear from the manuscript itself. Mozart wrote it with a pencil on the back of a circular by the Zürcher Musikkollegium (Zurich Music College) dated September 30, 1766. The circular invited sponsors, music lovers and other people who might be interested to concerts by "the young [9 years old] Master Mozart as well as his maiden sister" [Maria Anna - Nannerl] on October 7 and 9. It can be assumed that Mozart played or improvised this lively piece in one of those concerts, the programs to which are lost. Mozart wrote it on the back of the circular probably as a souvenir for the College's board; otherwise he would have used his sister's notebook or his third book of sketches (Skizzenbuch), which is also lost. The autograph became known very late (in 1942), and so is missing from Alfred Einstein's 3rd edition of the Köchel Verzeichnis. These are the notes as written by Mozart, including the bass line in bar 20 which should probably be identical to bar 6. NME Score at or . Critical notes: and . Their stay in Zurich came at the end of an extremely extensive tour of Europe which had started on June 9, 1763; they arrived back in Salzburg on November 29 or 30, 1766. The piece was most probably written and performed on a harpsichord, but as that instrument in the high register sounds quite awful on my soundcard, I selected the piano. I resisted the temptation to insert a ritardando at the end of the piece. June 2007, Michael Bednarek mb@mbednarek.com