In music, a canon is a contrapuntal compositional technique 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 (or dux), while the imitative melody, which is played in a different voice, is called the follower (or comes). The follower must imitate the leader, either as an exact replication of its rhythms and intervals or some transformation thereof (see "Types of canon", below). Repeating canons in which all voices are musically identical are called rounds – "Row, Row, Row Your Boat" and "Frère Jacques" being widely known examples. An example of a classical strict canon is the Minuet of Haydn's String Quartet in D Minor, Op. 76, No. 2 (White 1976, 66).
Accompanied canon is a canon accompanied by one or more additional independent parts which do not take part in imitating the melody.
- 1 History
- 2 Types of canon
- 3 How voices in a canon are named
- 4 Other types of canon
- 5 Elaborate use of canon technique
- 6 Contemporary canons
- 7 Media
- 8 See also
- 9 References
- 10 Further reading
- 11 External links
During the Middle Ages, Renaissance, and Baroque—that is, through the early 18th century—any kind of imitative musical counterpoints were called fugues, with the strict imitation now known as canon qualified as fuga ligata, meaning "fettered fugue" (Bridge , 76; Mann, Wilson, and Urquhart n.d.; Walker 2000, 1). Only in the 16th century did the word "canon" begin to be used to describe the musical form created by such a procedure (Mann, Wilson, and Urquhart n.d.). The word is derived from the Greek "κανών", Latinised as canon, which means "law" or "norm", and may be related to 8th century Byzantine hymns, or canons, like the Great Canon by St. Andrew of Crete. In contrapuntal usage, the word refers to the "rule" explaining the number of parts, places of entry, transposition, and so on, according to which one or more additional parts may be derived from a single written melodic line. This rule was usually given verbally, but could also be supplemented by special signs in the score, sometimes themselves called canoni (Bridge , 76). The earliest known non-religious canons are English rounds, a form called rondellus starting in the 14th century Mann, Wilson, and Urquhart n.d.; the best known is Sumer Is Icumen In (composed around 1250), called a rota ("wheel") in the manuscript source (Sanders 2001a; Sanders 2001b).
Types of canon
The most rigid and ingenious forms of canon are not strictly concerned with pattern but also with content. 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.
How voices in a canon are named
Although, for clarity, this article uses leader and follower(s) to denote the leading voice in a canon and those that imitate it, musicological literature also uses the traditional Latin terms dux and comes for "leader" and "follower", respectively.
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.
Another standard designation is "Canon: Two in One", which means two voices in one canon. "Canon: Four in Two" means four voices with two simultaneous canons. While "Canon: Six in Three" means six voices with three simultaneous canons, and so on.
A simple canon (also known as a round) imitates the leader perfectly at the octave or unison. Well-known canons of this type include the famous children's songs Row, Row, Row Your Boat and Frère Jacques.
If the follower imitates the precise interval quality of the leader, then it is called a strict canon; if the follower imitates the interval number (but not the quality—e.g., a major third may become a minor third), it is called a free canon (Kennedy 1994).
The follower is by definition a contrapuntal derivation of the leader.
Canon by inversion
An inversion canon (also called an al rovescio canon) has the follower moving in contrary motion to the leader. Where the leader would go down by a particular interval, the follower goes up by that same interval (Kennedy 1994).
In a retrograde canon, also known as a canon cancrizans (Latin for crab canon, derived from the Latin cancer = crab), the follower accompanies the leader backward (in retrograde). Alternative names for this type are canon per recte et retro or canon per rectus et inversus (Kennedy 1994).
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.[clarification needed] The cancrizans, and often the mensuration canon, take exception to the rule that the follower must start later than the leader; that is, in a typical canon, a follower cannot come before the leader (for then the labels 'leader' and 'follower' should be reversed) or at the same time as the leader (for then two lines together would constantly be in unison, or parallel thirds, etc., and there would be no counterpoint), whereas in a crab canon or mensuration canon the two lines can start at the same time and still respect good counterpoint.
Many such canons were composed during the Renaissance, particularly in the late fifteenth and early sixteenth centuries; Johannes Ockeghem wrote an entire mass (the Missa prolationum) in which each section is a mensuration canon, and all at different speeds and entry intervals. In the 20th century, Conlon Nancarrow composed complex tempo or mensural canons, mostly for the player piano as they are extremely difficult to play. Larry Polansky has an album of mensuration canons, Four-Voice Canons. Arvo Pärt has written several mensuration canons, including Cantus in Memoriam Benjamin Britten, Arbos and Festina Lente. Per_Nørgård's infinity series has a sloth canon structure (Mortensen n.d.). This self-similarity of sloth canons makes it "fractal like" and the same idea is explored in Fractal Tune Smithy's Sloth Canons
Other types of canon
The most familiar of the canons is the perpetual/infinite canon (in Latin: canon perpetuus) or round. As each voice of the canon arrives at its end it can begin again, in a perpetuum mobile fashion; e.g., "Three Blind Mice". Such a canon is also called a round or, in medieval Latin terminology, a rota. Sumer is icumen in is one example of a piece designated rota.
In a mirror canon (or canon by contrary motion), the subsequent voice imitates the initial voice in inversion. They are not very common, though examples of mirror canons can be found in the works of Bach, Mozart (e.g., the trio from Serenade for Wind Octet in C, K. 388), Webern, and other composers.
A Table canon is a retrograde and inverse canon 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. Bach wrote a few table canons (Benjamin 2003, 120).
Olivier Messiaen employed a technique which he called "rhythmic canon", a polyphony of independent strands in which the pitch material differs. An example is found in the piano part of the first of the Trois petites liturgies de la présence divine, where the left hand (doubled by strings and maracas), and the right hand (doubled by vibraphone) play the same rhythmic sequence in a 3:2 ratio, but the right hand adapts a sequence of 13 chords in the sixth mode (B-C-D-E-F-F-G-A-B) onto the 18 duration values, while the left hand twice states nine chords in the third mode (Griffiths 2001).
Elaborate use of canon technique
- Josquin des Prez, Missa L'homme armé super voces musicales, Agnus Dei 2: One voice with the words 'ex una voce tres' (three voice parts out of one), a mensuration canon in three voices.
- Josquin des Prez, Missa L'homme armé sexti toni, Agnus Dei 2: two simultaneous canons in the four upper voices, and at the same time a crab canon in the two lower voices.
- Johann Sebastian Bach's Goldberg Variations contains nine canons of increasing interval size, ranging from unison to ninth. Each canon additionally obeys the overall structure and harmonic sequence common to all variations in the composition.
In his early work, such as Piano Phase (1967) and Clapping Music (1972), Steve Reich used a process he calls phasing which is a "continually adjusting" canon with variable distance between the voices, in which melodic and harmonic elements are not important, but rely simply on the time intervals of imitation (Mann, Wilson, and Urquhart n.d.).
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- Benjamin, Thomas. 2003. The Craft of Tonal Counterpoint New York: Routledge. ISBN 0-415-94391-4 (accessed 14 April 2011)
- Bridge, J. Frederick. . Double Counterpoint and Canon. London: Novello & Co., Ltd.; New York: The H. W. Gray Co., Inc.
- Griffiths, Paul. 2001. "Messiaen, Olivier (Eugène Prosper Charles)". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- Kennedy, Michael (ed.). 1994. "Canon". The Oxford Dictionary of Music, associate editor, Joyce Bourne. Oxford and New York: Oxford University Press, ; ISBN 0-19-869162-9.
- Mann, Alfred, J. Kenneth Wilson, and Peter Urquhart. n.d. "Canon (i)." Grove Music Online. Oxford Music Online (Accessed 2 January 2011) (subscription required).
- Mortensen, Jørgen. n.d. "The 'Open Hierarchies' of the Infinity Series". In Per Nørgård: En introduktion til komponisten og hans musik (Danish and English), edited by Jørgen Mortensen. www.pernoergaard.dk (Accessed 20 January 2013).
- Sanders, Ernest H. 2001a. "Rota". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- Sanders, Ernest H. 2001b. "Sumer is icumen in". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- White, John David. 1976. The Analysis of Music. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-033233-X.
- Walker, Paul Mark. 2000. Theories of Fugue from the Age of Josquin to the Age of Bach. Rochester, NY: University of Rochester Press. ISBN 9781580461504.
- Agon, Carlos, and Moreno Andreatta. 2011. "Modeling and Implementing Tiling Rhythmic Canons in the OpenMusic Visual Programming Language". Perspectives of New Music 49, no. 2 (Summer): 66–91.
- Amiot, Emmanuel. "Structures, Algorithms, and Algebraic Tools for Rhythmic Canons". Perspectives of New Music 49, no. 2 (Summer): 93–142.
- Andreatta, Moreno. 2011. "Constructing and Formalizing Tiling Rhythmic Canons: A Historical Survey of a 'Mathematical' Problem". Perspectives of New Music 49, no. 2 (Summer): 33–64.
- Davalan, Jean-Paul. 2011. "Perfect Rhythmic Tiling". Perspectives of New Music 49, no. 2 (Summer): 144–97.
- Johnson, Tom. 2011. "Tiling in My Music". Perspectives of New Music 49, no. 2 (Summer): 9–21.
- Lamla, Michael. 2003 Kanonkünste im barocken Italien, insbesondere in Rom. 3 vols. Berlin: Dissertation.de—Verlag im Internet. ISBN 3-89825-556-5.
- Lévy, Fabien. 2011. "Three Uses of Vuza Canons". Perspectives of New Music 49, no. 2 (Summer): 23–31.
- Messiaen, Olivier. Traité de rythme, de couleur, et d'ornithologie (1949–1992). I-II, edited by Yvonne Loriod, preface by Pierre Boulez. Paris: Leduc, 1994.
- Schiltz, Katelijne, and Bonnie J. Blackburne (eds.). 2007. Canons and Canonic Techniques, 14th–16th Centuries: Theory, Practice, and Reception History. Proceedings of the International Conference Leuven, 4–5 October 2005. Analysis in Context: Leuven Studies in Musicology 1. Leuven and Dudley, Massachusetts: Peeters. ISBN 978-90-429-1681-4.
- Vuza, Dan Tudor. 1991–93. "Supplementary Sets and Regular Complementary Unending Canons", in four parts. Perspectives of New Music 29, no. 2 (Summer 1991): 22–49; 30, no. 1 (Winter): 184–207; 30, no. 2 (Summer, 1992): 102–25; 31, no. 1 (Winter 1993): 270–305.
- Ziehn, Bernhard. Canonic Studies: A New Technique in Composition, edited and introduced by Ronald Stevenson. New York: Crescendo Pub., 1977. ISBN 0-87597-106-7.
- Anatomy of a Canon
- The Musical Offering --A Musical Pedagogical Workshop by J.S. Bach, or, The Musical Geometry of Bach's Puzzle Canons
- Visualization of J. S. Bach's crab canon
- Software SonneLematine to produce canons
- Electro-Acoustic Music Dartmouth.edu: Larry Polansky's Four Voice Canons
- Watch Canon, a film by Norman McLaren at NFB.ca
- Video Canon (My Favorite Things)