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It is known by the name of canon to certain precepts, provisions or catalogs . This Latin word of Greek origin usually refers to a perfect features model (“He acted according to the canons of the company”) and the periodic obligation payments that are taxed services or products . To cite a practical example: "The canon promoted by the Spanish government to tax digital products is rejected by a large part of the population".

Canon, on the other hand, is a concept with multiple applications within the scope of the religion . By canon, for example, the regulations that a council of the Catholic Church fixes in relation to dogma, the catalog of sacred works for Catholic worship, the book the bishop uses when giving mass and the part of the mass are known which concludes with the prayer of Our father .

He beauty canon Instead, it encompasses the traits that a society Consider as attractive, desirable or beautiful. Just like fashion, these standards are constantly changing, and tend to return to their roots; a style of clothing worn in the fifties is considered old until, half a century later it is imposed again.

For him right , the fee constitutes the price to be paid in exchange for the rustic lease of a property and the amount that must be contributed to the State periodically for a specific concession.

Canon Inc. Finally, it is a renowned Japanese company founded in 1933 and specialized in the production of cameras, printers and other technological devices.

Among movie and video game fans, on the other hand, it is very common to hear the term "canonical" to refer to those events that are considered part of the original story, which respond to the origins of a saga or series of titles, and that they were not forcibly included, either because of the change of screenwriters or because of market issues. It refers to a data whose membership in the universe of a particular work cannot be denied in any way, however excellent the argument used.

The musical canon

In the music , by canon the polyphonic composition is understood in which the voices are introduced successively, each one imitating the song that precedes it. The original voice is called a proposal; at a certain number of measures away, the voices that are known as the response begin.

At the end of the 17th century, the German composer Johan Christoph Pachelbel wrote one of his most remembered works: the Canon in D major for three violins and continuous bass. This piece enjoys great popularity both in the academic and in the popular environment, and certainly collaborated considerably with the acceptance of the canon as a type of composition.

Other great composers, such as Haydn and Mozart, have written canons in their works, although Bach brought this form to its splendor, which was lost with the arrival of romanticism, where the text and the message became more important than the melodies.

According to the changes suffered by voices, there are several types of fees, among which are:

* Canon circular: also called infinity, it is one where repetition could never end, given its structure;

* Spiral Canon: in each response, a modulation with respect to the previous voice, making its execution very difficult, especially if it is a sung piece;

* Canon of opposite movement: the repetition is the inversion of each interval of the canonical theme, where in general the type of interval is maintained diatonically, which does not guarantee that the resulting tonal distance is the same. A clear example is to take the DO RE line and generate the DO SI canon, where the second major Becomes a second minor, since between DO and RE there are two semitones and between DO and SI, only one.

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