With a total duration time of 9:20. Available in SmartMusic. this contest bestseller features three contrasting movements: I. a spirited Allegro in cut time; II. a beautiful Larghetto in 3/4; and III. a lively Menuetto in 3/4 time. Originally written for three wind instruments around 1783, this is the first of Mozart's six Viennese sonatinas (K439B). .