K. 72 Allegro C major 4/4 2:50 (including repeats)

It begins with the unison repetition of tonic chord tones, strongly emphasizing the tonic.

This motive of unison repetition also appears at the end of each half-section when the target key is finally established, and its function as a clear statement of the stable tonic chord can be noted.

On the other hand, this motive appears in measure 27 in the latter half, after a series of modulations, leading to a modulation to the relative key of the tonic via a momentary subdominant key. In other words, here the motive is associated with a function that contrasts with its definitive statement of the key at the beginning and end.