The middle of the movement contains a brighter section in A major announced by flute and clarinet that Mozart would later use to introduce the trio "Ah! taci ingiusto core!" in his 1787 opera Don Giovanni. The dynamics are soft throughout most of the piece. This is the only movement by Mozart in F ♯ minor. The piano begins alone with a theme in Siciliano rhythm characterized by unusually wide leaps. The slow second movement, in ternary form, is somewhat operatic in tone. This is also expressed in the use of chromatics in the melody and bass lines which is a source of harmonic tension, as the listeners anticipate the arrival of the tonic. This is expressed by dissonances that are played on the beat, and then solved by an interval of a descending second. The second exposition is ornamented as opposed to the first exposition which is not.
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It also includes the previously unheard third theme. The second exposition includes the soloist and is modulatory. The first exposition is static from a tonal point of view and is quite concise, the third theme is not yet revealed.
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The piece begins with a double exposition, the first played by the orchestra, and the second when the piano joins in. The first movement is in A major and is in sonata form. Allegro assai in A major and alla breve, rondo form.