Prussian Quartets-This volume opens with something unusual: opus 42 is a single work short and surprisingly easy to play; Haydn described it as 'something small and with only 3 pieces'. The Quartets op. 50 including the so-called Frog Quartet are dedicated to the Prussian king Friedrich Wilhelm II who was a talented cellist. Even though the 'solo' at the beginning of opus 50 1 is meant as joke there are some good passages for cellists.