Bach’s “Canon a 2 Cancrizans” from “The Musical Offering”: A Divine Puzzle

The canon, which features one or more imitations of the same melodic line performed at varying intervals over a given duration, is one of music’s most intriguing contrapuntal devices. In The Musical Offering, BWV 1079, J.S. Bach takes this technique a step further with the canon cancrizans, or “crab canon.” Here, the melodic line can be played as written, and also in reverse, in a way similar to a crab crawling backwards. …

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