[No.] 9 [Description] The prelude is written on three staves where left and right hands take turns playing on the center staff. The piece with few exceptions consists of unison quindicesima melodies beginning first in the lowest tessitura of the piano then the highest. Mixed meters riddle the contour of the simple melodies, and toward the middle, an alto voice of accompanying chords provides diversity to the unisonal melody. The fugue in 3/4 time is a frantic scurry with fast notes and staccato markings. Only two voices develop with increasing stretto in the middle culminating at the end when the two voices join in unison as before in the prelude though only with an octave separation. [Key] 
E major