Oleg Zabluda's blog
Tuesday, March 27, 2012
 
Crab canon (Latin: canon cancrizans, in Russian would be crayfish canon)—is an arrangement of two musical lines that...
Crab canon (Latin: canon cancrizans, in Russian would be crayfish canon)—is an arrangement of two musical lines that are complementary and backward, similar to a palindrome. A famous example is found in J. S. Bach's The Musical Offering, which also contains a canon ("Quaerendo invenietis") combining retrogression with inversion, i.e., the music is turned upside down by one player, which is a table canon.

Table canon is meant to be placed on a table in between two musicians, who both read the same line of music in opposite directions. As both parts are included in each single line, a second line is not needed.

Mirror canon is a type of canon which involves the leading voice being played alongside its own inversion (i.e. upside-down). The page can be put in front of a mirror, thus upside down, and beginning with the already progressing first voice.

http://en.wikipedia.org/wiki/Crab_canon
http://en.wikipedia.org/wiki/Table_Canon
http://en.wikipedia.org/wiki/Mirror_canon
http://en.wikipedia.org/wiki/The_Musical_Offering

J.S. Bach - Crab Canon on a Möbius Strip
http://www.youtube.com/watch?v=xUHQ2ybTejU

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