Classical. String Quartet No. 22 in B-flat major, K. 589 was composed in May 1790 and is the second of the Prussian Quartets in four movements (1. Allegro, 2. Larghetto, 3. Menuetto, 4. Allegro assai). The quartet, written in the style of Haydn, is dedicated to Friedrich Wilhelm II, the King of Prussia, an amateur cellist. This arrangement by Charles Vernon of the Chicago Symphony for trombone quartet is about 24 minutes in length and is appropriate for virtuoso performers. -the publisher