Variants
The original chorale preludes composed in Weimar are numbered BWV 651a, 652a, etc. When there are two or three earlier versions, the numbering uses other letters of the alphabet, for example BWV 655a, 655b and 665c. The variant BWV 668a is the complete version of the chorale prelude that was published as an appendix to the Art of the Fugue, possibly to compensate for the unfinished final fugue, Contrapunctus XIV.
Read more about this topic: Great Eighteen Chorale Preludes
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