Crab canon, or canon cancrizans, is designed so that while the main voice moves forward the same part is played backwards. The mid-point is the most difficult to compose as the part writing, through identical material, may be spoiled by stagnation.
[suit la citation des 4 mesures centrales du cannon cancrizans de l'Offrande musicale]
Reginal Smith Brindle, Musical composition, Oxfor university press, page 45.
Il met aussi en garde, un peu plus loin, contre un excès d'intellectualisme (contrepoint trop dense). - Compositeur .org - Forum des Compositeurs : Musique et Composition
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