clarinet quartet

"There will hardly be any other piece that might fit the term "air" (song, melody) - derived from the French language - better than the composition on hand. To facilitate its performance in various instrumentations, all the voices are written in C (flute, violin, ...) and Bb (clarinet). Additionally, the third voice is written in Eb (alto clarinet, alto saxophone) and F (basset horn). This way, many different settings are possible".
Alternative Part printed back-to-back Instrumentation : 4 clarinets / flexible instrumentation (1st part in Bb or C, 2nd part in Bb or C, 3rd part in Bb, C, Eb or F, 4th part in Bb or B. C.) BWV 1068