The first of these, composed between the monumental String Quintet in D and the Piano Concerto in Bb KV 595, is an A-B-A form, comprised of an f minor Adagio opening and closing, with a contrapuntal Allegro at its heart. KV 608 is more complicated, opening with an f minor section reminiscent of a French Overture, followed by a fugue in f minor, then an Andante aria, followed by a return to the opening and then a more complex version of the fugue.
Despite the frustration that Mozart expressed (in a letter to Constanze) with the sound world of these mechanical devices, KV 594 and 608 are remarkable works which stand at an intersection, incorporating what he learned about counterpoint studying at the foot of Bach, while looking ahead to the emotional and harmonic poignancy of Schubert. -the publisher