Simplest type of metric modulation in Bach. Slow introduction followed by Allegro, traditionally taken twice as fast. Eighth notes in the new tempo prepared by sixteenth notes in the old tempo ( = ).
A sound file recorded on my iphone 11 simulating walking through woods, hearing something that makes you start running until you suddendly falls. . . Then silence. . .
An ascending fifths sequence in C major. Notice the "circle of fifths" pattern in the lower staff similar to the descending fifths sequence, except going in the opposite direction.
