The Allegretto finale of Mozart’s Sonata in B-flat major, K. 570, begins with a light pickup and an upper melody that plays across the beat. Steady broken chords in the left hand support its short phrases, ties, and small ornaments. Contrasting episodes bring fuller chords, lively scales, and more independent exchanges between the hands. This advanced finale combines rhythmic precision with an easy, conversational character and a broad range of articulation.

The main theme relies on the difference between detached notes and connected gestures. Keep the accompaniment even while allowing the upper line to lean naturally toward its important notes. The pickup should lead into the phrase without receiving unnecessary emphasis. As the theme develops, brief runs and changes of register add brightness. A quieter return preserves the same outline with a different dynamic, so clarity of touch matters even when the sound becomes softer.

The first contrasting episode introduces more prominent double notes and chords over a moving bass. Its two sections are repeated, with scales and harmonic changes increasing the energy. A later episode begins with evenly moving repeated notes and short lower responses, then develops through chromatic lines and changes of texture. These repeated sections give the movement a clear sequence of contrasts. A transition leads back to the main theme, after which further dialogue, a longer trill, and a quiet closing passage bring the finale to its conclusion.

Practice the theme with a steady underlying beat before adding expressive flexibility. Listen carefully to tied notes so that their duration does not become shortened by the accompaniment. For chordal passages, prepare the hand shape early and use a light release. Learn scales in groups that follow the phrase, and practice hand exchanges as one line. In the later episode, keep repeated notes even while distinguishing the bass responses from the upper motion. Rehearse the transitions into recurring material so that each return sounds settled.

A distinctive feature is the variety of rhythm within the recurring theme: offbeat attacks, rests, ties, and brief ornaments all contribute to its character. These details need to remain clear without making the performance fussy. The final pages extend the dialogue through different registers and a sustained trill before returning to softer gestures. Keep listening for the larger phrase through this detail. The ending works best when its quieter sound retains the same rhythmic confidence that made the opening lively.

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