Last Friday, the harpsichordist Florian Birsak performed in the Dancing Master’s Hall of the Mozart Residence in Salzburg, for the first time in something like two centuries, a small, 84-measure, Allegro Molto for keyboard believed to have been written by the eleven-year-old prodigy Wolfgang Amadeus Mozart circa 1767.

The composition was found last year in a 160-page collection of musical pieces discovered in the attic of a private home in the Tyrol. The manuscript was apparently written by a John Reiserer, born 1765 in Rattenburg, while a student at the Universitätsgymnasium in Salzburg, which he attended between 1778 and 1780.

Musicologists agree that the Allegro is a composition of Wolfgang Amadeus Mozart unrecorded in the Köchel directory of his compositions.

The Allegro is a sonata movement, reminiscent of an Allegro in Nannerl Mozart’s Notenbuch and of the opening movement of the Piano Sonata No. 1 in C-Major K.279.

Neu entdecktes Mozart-Stück zu hören has a link to the 3:48 Birsak performance.

So klingt das „Allegro molto“ von Mozart also links the performance.