The Art of Fugue
The first of AOF’s canons is also the simplest. In this canon “at the octave,” the two voices are always separated by an octave, with the canon follower four bars behind the leader. The subject is a florid variation of the main AOF subject.
Within the constraint of always appearing at the octave, the leader and follower are presented in both regular and inverted forms, and in D minor and A minor. The subject has the playful character of a gigue, and I have scored it accordingly.
This is a beautifully symmetric canon, with the leader and follower presented nine (3 x 3) times.