Special thanks to @radnoll for the recommendation! According to IMSLP Bach composed this piece when he was around 20 years old. I can see how Bach came back to this at least twice later in his life:
1. The theme of the Fugue in D-sharp minor from WTC 1 is a condensed modification. A comparison is shown in the first few seconds.
2. For its _stile antico_ ("ancient style") and other features, some passages bear strong resemblance to the unfinished fugue from the Art of Fugue.

In my interpretation there is a gradual crescendo within each section and a larger crescendo throughout the entire piece. Hence I've chosen to double the bass starting from b.150. For those who disagree with this interpretation the bass octaves can be omitted.

The actual key signature of D minor is used following conventional practice.
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*Canzona in D minor, BWV 588 by Johann Sebastian Bach (1685-1750)*
0:00 Theme comparison with the Fugue in D-sharp minor from WTC 1
0:03 Section A (4/4)
3:47 Section B (3/2)
Arr.: Ruoshi Sun (2024)
Piano: Ruoshi Sun (2024) on CLP-785
Temperament: Werckmeister
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*Links*
Score download: [ Ссылка ]

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