Piece in F for Keyboard K.33b (Mozart)
Encyclopedia
The Klavierstück in F K. 33b, is a keyboard
Keyboard instrument
A keyboard instrument is a musical instrument which is played using a musical keyboard. The most common of these is the piano. Other widely used keyboard instruments include organs of various types as well as other mechanical, electromechanical and electronic instruments...

 work written by Wolfgang Amadeus Mozart
Wolfgang Amadeus Mozart
Wolfgang Amadeus Mozart , baptismal name Johannes Chrysostomus Wolfgangus Theophilus Mozart , was a prolific and influential composer of the Classical era. He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, piano, operatic, and choral music...

; its tempo
Tempo
In musical terminology, tempo is the speed or pace of a given piece. Tempo is a crucial element of any musical composition, as it can affect the mood and difficulty of a piece.-Measuring tempo:...

 marking is Allegro. It is 26 bars
Bar (music)
In musical notation, a bar is a segment of time defined by a given number of beats of a given duration. Typically, a piece consists of several bars of the same length, and in modern musical notation the number of beats in each bar is specified at the beginning of the score by the top number of a...

 long, divided into two sections of 12 and 14 bars, each repeated.

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 (Zürich
Zürich
Zurich is the largest city in Switzerland and the capital of the canton of Zurich. It is located in central Switzerland at the northwestern tip of Lake Zurich...

 Music College) dated September 30, 1766, when the Mozart family came to the end of their Grand Tour
Mozart family grand tour
The Mozart family grand tour was a journey through western Europe, undertaken by Leopold Mozart, his wife Anna Maria, and their musically gifted children Maria Anna and Wolfgang Amadeus from 1763 to 1766. At the start of the tour the children were aged eleven and seven respectively...

. 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
Maria Anna Mozart
Maria Anna Walburga Ignatia Mozart , nicknamed "Nannerl", was a musician, the older sister of Wolfgang Amadeus Mozart and daughter of Leopold and Anna Maria Mozart.-Childhood:...

) 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.
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