Analysis of Bach's fugue BWV 871 in C minor (WTC, Book II)

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augmentation and inversion

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J. S. Bach's C minor fugue BWV 871 from the second book of the WTC offers an excellent example of three contrapuntal techniques: a) the stretto, b) augmentation and c) inversion or contrary motion.

The next animation uses measures 14 to 16 of this fugue to show what is an stretto, augmentation and inversion:

Complete analysis of the fugue: