Canon (music)
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This article is about the musical use of the word "canon". For other uses, see canon.
In music, a canon is a contrapuntal composition that employs a melody with one or more imitations of the melody played after a given duration (e.g. quarter rest, one measure, etc.). The initial melody is called the leader, while the imitative melody is called the follower which is played in a different voice. The follower must be created from the leader by being either an exact replication of the rhythms and intervals of the leader, or a transformation such as those listed in "types of canons" (below). The simplest and most familiar examples are rounds such as Row, Row, Row Your Boat.
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History
The canon has its origins in Italy and France and was originally called caccia. The Old French canon, which meant 'leaned', was taken from the Greek kanon for a rule or law, which eventually came to mean 'an accepted rule' in English. The most rigid and ingenious forms of canon are not strictly concerned with pattern but also with content. During the period of the Netherland School (1450-1500), canon as a contrapuntal art form received its greatest development, while the Roman School gave it its most complete application.
Types of canons
Canons are classified by various traits: the number of voices, the interval at which each successive voice is transposed in relation to the preceding voice, whether voices are inverse, retrograde, or retrograde-inverse; the temporal distance between each voice, whether the intervals of the second voice are exactly those of the original or if they are adjusted to fit the diatonic scale, and the tempo of successive voices. However, canons may use more than one of the above methods.
Number of voices
A canon of two voices may be called a canon in two, similarly a canon of x voices would be called a canon in x. This terminology may be used in combination with a similar terminology for the interval between each voice, different from the terminology in the following paragraph.
Interval
An interval canon imitates the leader at any interval other than the octave or unison (e.g. canon at the second, fifth, seventh, etc.). If the follower imitates the precise interval quality of the leader, then it is called an exact canon; if the follower imitates the interval number (but not the quality), it is called a diatonic canon.
Contrapuntal derivations
The follower may be a contrapuntal derivation of the leader.
Inverse
An inverted canon (also called canon in contrary motion) moves the follower in contrary motion to the leader. Where the leader would go down a fifth, the follower goes up, and vice versa. A sub-order of canon in contrary motion, "mirror," maintains the precise quality of each interval.
Retrograde
In a crab canon, also known as cancrizans, the follower accompanies the leader backward (in retrograde).
Mensuration and tempo canons
In a mensuration canon (also known as a prolation canon, or a proportional canon), the follower imitates the leader by some rhythmic proportion. The follower may double the rhythmic values of the leader (augmentation or sloth canon) or it may cut the rhythmic proportions in half (diminution canon). Phasing involves the application of modulating rhythmic proportions according to a sliding scale. The cancrizans, and often the mensuration canon, take exception to the rule that the follower must start later than the leader. Conlon Nancarrow composed complex tempo or mensural canons, mostly for the player piano as they are extremely difficult to play; they have also influenced many younger composers. Larry Polansky has an album of mensuration canons, Four-Voice Canons.
Other types of canons
The most familiar of the canons might be the perpetual/infinite canon (in latin: canon perpetuus). As (each voice of) the canon arrives at its end it can begin again, in a Perpetuum mobile fashion; e.g. "Three Blind Mice".
Additional types include the spiral canon, accompanied canon, and double or triple canon.
Contemporary canons
The most popular canons heard today are from the Baroque period, such as Johann Pachelbel's Canon in D (Pachelbel's Canon) or every third variation in Bach's Goldberg Variations. What may be George Rochberg's best known work, his String Quartet No. 6, includes a set of variations on the Pachelbel Canon in D. Henryk Górecki's Third Symphony begins with an extensive eight voice canon in the strings. Steve Reich uses a process he calls phasing which is a canon with variable distance between the voices. Many popular recording artists have found success by sampling portions of famous canons in their compositions.
Listening
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Listen to J. S. Bach's Canon per augmentationem contrario motu (inverted sloth canon) (16.6 kB MIDI file), part of Bach's Musical Offering.
Reading
Canonic Studies: A New Technique in Composition. Bernhard Ziehn; edited and introduced by Ronald Stevenson. Publisher: New York : Crescendo Pub., 1977. ISBN 0875971067.
External link
- Anatomy of a Canon (http://jan.ucc.nau.edu/~tas3/canonanatomy.html)
- Electro-Acoustic Music Dartmouth.edu: Larry Polansky's Four Voice Canons (http://eamusic.dartmouth.edu/~larry/fvc/)da:Kanon (musik)
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