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Bach's Crab Canon https://youtube/watch?v=xUHQ2ybTejU

Explore the fascinating realm of canons in music, from Bach's renowned Crab Canon to historical examples like the Summer Canon. Learn about different types of transformations and delve into Bach's Musical Offering inspired by a challenge from Emperor Frederick II of Prussia.

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Bach's Crab Canon https://youtube/watch?v=xUHQ2ybTejU

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  1. Bach's Crab Canon https://www.youtube.com/watch?v=xUHQ2ybTejU

  2. Canon: piece of music made of one melody and one or several imitations of it, played after some delay, either identically or transformig it in some way. Typical examples: • Frere Jacques, • Row, row, row your boat (00:45)https://www.youtube.com/watch?v=AtX2RC-xCEQ • Menuet from Haydn't string quartet(12:20) https://www.youtube.com/watch?v=1LeDX3rzrOg • One of the oldest examples(13th century): the summer Canon https://www.youtube.com/watch?v=VWgbEqnfUho

  3. Types of transformations: • simple: the follower imitates the leader at an octave interval, after fixed delay; • Inversion: the follower goes up whenever the leader goes down and the other way around. (https://www.youtube.com/watch?v=e4rKtbqpueM) • Retrograde canon(crab canon): the follower plays the leader backwards( Bach's crab canon) • Mensuration canon: the follower imitates the leader with some rythmic proportion • Table canon: retrograde and inversion: meant to be placed on a table between two musicians (https://www.youtube.com/watch?v=OtUOLzU7C2g)

  4. The musical Offering: • Collection of pieces, mostly canons, based on a theme given to Bach by the emperor Frederick II of Prussia when Bach visited his son, who was a court musician in Postdam. • Frederick presented the fortepiano and challenged Bach to improvise on a theme. • Bach improvised a three voices fugue, then was challenged to compose a 6 voices one. The result is the musical offering, which he sent to the emperor 2 months later.

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