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score (pdf) annotated 

Theme with harmonic background:

Taken from Ludwig Czacskes:

Czacskes WTK I G harmonische grundlage

Five Rounds of theme entries; short interal episodes (Binnenzwischenspiel) and long episodes with harmonic sequential patterns (sometimes in the form of a chain of dominants).

Czacskes WTK I G.1

Keys: G major, D major, G major

Czacskes WTK I G.2

Keys: G major, D major, G major

Czacskes WTK I G.3

Keys: E minor, E minor

Czacskes WTK I G.4

Keys: B minor, D major

Czacskes WTK I G.5

 Keys G major, D major