The fortepiano has leather-covered hammers and thin, harpsichord-like strings. It has a much lighter case construction than the modern piano and, except for later examples of the early nineteenth century (already evolving towards the modern piano), it has no metal frame or bracing. The action and hammers are lighter, giving rise to a much lighter touch, which in good fortepianos is also very responsive. The range of the fortepiano was about four octaves at the time of its invention and gradually increased. Mozart (1756–1791) wrote his piano music for instruments of about five octaves.
I'm posting all three movements of this incredible concerto simply because all three movements merit a listen. So sit back and enjoy.
It has three movements:
Allegro in A major and common time.
Adagio in F-sharp minor and 6/8 time (in later editions, the tempo is listed as Andante).
Allegro assai in A and alla breve (in later editions, the tempo is listed as Presto).
The first movement is mostly joyful and positive with the occasional melancholic touches typical of Mozart pieces in A major.
The third movement is a rondo, shaded by moves into other keys as is the opening movement (to C major from E minor and back during the secondary theme in this case, for instance) and with a central section whose opening in F sharp minor is interrupted by a clarinet tune in D major, an intrusion that reminds us, notes Girdlestone, that instrumental music at the time was informed by opera buffa and its sudden changes of point of view as well as of scene. ~Wikipedia