Invention No. 12 BWV 783 in A Major

Invention no. 12 is based on two subjects. Episodes between subjects presentations modulate to several closely related keys in a fugue-like way.

Subject presentation or exposition	Measures 1 to 5	A major and E major
Episodes	Measures 5 to 8	Modulates to F# minor
Subject presentation	Measures 9 to 12	F# minor and C# minor.
Episodes	Measures 13 to 18	Returns to A major.
Subject presentation and coda	Measures 18 to 21	A major.
Complete Invention

Invention No. 12 BWV 783 in A Major by Bach