Invention no. 9 BWV 780 is based on two subjects. Episodes between subjects presentations modulate to several closely related keys in a fugue-like way.

Subjects presentation or exposition	Measures 1 a 9	F minor
Episodio	Measures 9 to 17	Modulates to C minor
Subjects presentation	Measures 17 to 21	C minor.
Episode	Measures 21 to 29	Brings us back to F minor via Ab major.
Subjects presentation	Measures 29 to 34	F minor.
Complete Invention

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