Strongly rhythmic contours, constant pulse, and chromaticism. Uses upper neighbor Appagiatura with a flat vi, which goes to V. Modal contrast used. G becomes tonicized. A lot of sequence, and later comes back to A minor. Bb goes to A. Shifts to D major.
Same patterns occur.
Brings in foreshadowing of A section's flat vi-V, and sets up for beginning. Ends with more transitional set-up for return, tonally and motivically. Contrary by mode, makes Bb flat vi. Sets up D major. More static, pedal in the left hand.