The Allegro in F, K. 1c, is a keyboard work, written by Wolfgang Amadeus Mozart in 1761. It is part of a group of keyboard works found in Nannerl's Music Book. It is an extremely short piece (just 30 seconds long), likely notated by his father, Leopold Mozart, since Wolfgang was six years old at the time. Specifically composed on 11 December, 1761 in Salzburg.
It was written for the harpsichord and is hence often performed on the harpsichord today, though other keyboard instruments may be used. The Allegro is in Mozart's first collection of works, and his first extant piece in F major. Similar to his first piece, Allegro in C, it is in a slow tempo, and has several repeated phrases as follows: AABB[piano]ABB[piano]A - each phrase being about 5 seconds.