Mozart's Piano Concerto No. 23 unfolds in three movements, with an F-sharp minor Adagio at its heart.

The concerto moves through three movements — Allegro in A major, Adagio in F-sharp minor, and Allegro assai in rondo form. That central Adagio in F-sharp minor is the emotional core: an unusually dark key for Mozart, giving the whole concerto a bittersweet weight that sets it apart from his sunnier piano concertos.