The “Haffner” symphony was composed at the request of Leopold Mozart for the ennoblement celebrations of Wolfgang’s childhood friend Sigmund Haffner on 29 July 1782 in Salzburg. Mozart was under considerable pressure at the time, occupied not only with preparations for the premiere of Die Entführung aus dem Serail on 16 July, but also with arrangements for his forthcoming marriage to Constanze on 4 August. It is unclear from the surviving evidence (the relevant correspondence between Wolfgang and Leopold for this period is incomplete) whether the work arrived at Salzburg in time for the Haffner event. The Symphony was first performed in Vienna, under Mozart’s direction, at the Hofburgtheater on 23 March 1783 in the presence of the Emperor.

Here in a keyboard arrangement by Johann Nepomuk Hummel.

“These editions of transcriptions by Hummel are a very welcome addition to the extensive set of his arrangements of Mozart’s concertos and symphonies published by Edition HH. [They] are fine examples of the important genre of piano transcription of the orchestral and operatic repertoire [and] as such, they are greatly to be treasured by anyone with an interest in the burgeoning piano repertoire of the 19th century.”
The Consort, Vol. 79, 2023

 Music example (pdf)