Structure

These images show the structure of both fugues. Red sections indicate a subject or answer and blue sections episodes. Triangles show ascending or descending versions of the subjects:

This table summarizes the structure:

Measures
1-13	13-19	20-24	24-28	29-41	41-47	47-52	52-61	62-71
Exposition	First episode	Subject in D minor	Second episode	Second exposition in the submediant (rectus) and mediant (inversus) keys	Third episode	Subject in D minor	Fourth episode	Final presentation

Notes:

• Throughout the fugue the voices alternate between ascending and descending versions of the subject.
• Although starting in different voices, the entries follow the same circular order: S - A - B - S - A - B... (see Fugues Expositions Classification Using Circles)

Summary of all subjects and answers:

Fugue	Exposition	Second exposition	Final presentation (measure 62)
Rectus	A - B - S	B - S - A	B - S
Inversus	S - A - B	A - B - S	A - B