How does Mozart handle the return of the tonic key in a recapitulation?

In sonata form, Wolfgang Amadeus Mozart manages the return of the tonic key and subject during the recapitulation with understated punctuality. Unlike Haydn or Beethoven, who often celebrate this transition with significant musical panoply, Mozart allows the actual moment of recapitulation to glide in almost unnoticed.1

While the recapitulation typically presents the principal subject matter in the tonic key to achieve a state of equilibrium, Mozart’s approach to this return is characterized by subtlety. He often employs only minor modifications to the transition—such as those seen in his Sonata in B-flat Major, K 570—to shift the key perspective and ensure the second subject is heard in the tonic. Additionally, Mozart frequently reshapes his second subjects drastically when they reappear in the recapitulation, further demonstrating his individual handling of these structural requirements.12