All six quartets have only three movements. Four of the quartets (K. 156-159) have middle movements in the minor mode, one of which (that of K. 159) is, unusually, not a slow movement, but a fiery sonata-allegro. The finales are generally lightweight, usually minuets or rondos.Heartz, Daniel, Haydn, Mozart, and the Viennese School, 1740-1780. W.W. Norton & Company (), pp. 561–562 (1995).
