In music, a canon is a contrapuntal (counterpoint-based) compositional technique or texture 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.
Why are some composers fascinated with canons? Canons are not unlike puzzles and other brainteasers: from just a few rules, you can achieve so much. Plus, canons have the appeal of any puzzle. There is the initial challenge, the mystery of solving it, and the feeling of satisfaction you get from completing it. (Davidian 2015, 136)
Accompanied canon is a canon accompanied by one or more additional independent parts which do not take part in imitating the melody.
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 strict, imitative texture 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).
Canons featured in the music of the Italian Trecento and the 14th century music of France. A famous example from Italy is “Tosto che l’Alba” by Gheraldo da Firenze. In both France and Italy, canons were often used to illustrate hunting songs. The Italian word for hunting is “caccia”, the French word “chace.” A well-known French Chace is the anonymous “Se je chant”. Taruskin (2010, p331) admires “Se je chant”, which evokes the atmosphere of a falcon hunt: “the middle section is truly a tour de force… a riot of hockets set to 'words' mixing French, bird-language, and hound language in an onomatopoetical mélange.” Guillaume de Machaut also used the 3-voice “chace” form in movements from his masterpiece Le Lai de la Fontaine (1361). Referring to the setting of the fourth stanza of this work, Taruskin (p.334) describes as “harmony in the most literal, etymological sense. Like the Trinity itself, a well-wrought chace can be far more than the sum of its parts; and this particular chace is possible Machaut’s greatest feat of subtilitas.”
An example of late 14th century canon which featured some of the rhythmic complexity of the late 14th century ars subtilior school of composers is "La Harpe de Melodie" by Jacob de Senleches:
In many pieces in three contrapuntal parts, only two of the voices are in canon, while the remaining voice is a free melodic line. In Dufay’s song “Resvelons nous, amoureux”, the lower two voices are in canon, but the upper part is what David Fallows (1982, 89) describes as a “florid top line”:
Both J.S. Bach and Handel featured canons in their works. The final variation of Handel’s keyboard Chaconne in G major (1858)(G228) is a canon in which the player’s right hand is imitated at the distance of one beat, creating rhythmic ambiguity within the prevailing triple time:
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):
Beethoven’s works feature a number of passages in canon. The following comes from his Symphony No. 4:
Antony Hopkins (1981, 108) describes the above as “a delightfully naïve canon.” More sophisticated and varied in its treatment of intervals and harmonic implications is the canonic passage from the second movement of his Piano Sonata 28 in A major, Op. 101:
Martin Cooper (1970, 151) sees Beethoven’s late style, which this piece exemplifies, as characterised by a “refusal to plane away the angularities involved in strictly canonic writing.”
An even subtler example comes from Beethoven’s Piano Sonata 29 ("The Hammerklavier") Op. 106 (1819). Wilfrid Mellers (1982, 176) describes the trio section of the scherzo movement, as “mysterious”, with a metrical ambiguity that “makes the melodic phrases irregular.” When the tune is repeated, it is “now in the left hand, [with] the flowing triplets in the right... in canon with the bass line.” Mellers concludes: “Here contrapuntal oneness serves to control any airy floating in the tune’s asymmetry: it is not merely the wide-spread texture that sounds hollow, almost forlorn.” :
In the Romantic era, the use of devices such as canon was even more often subtly hidden, as for example in Schumann’s piano piece "Vogel als Prophete" (1851):
According to Nicholas Cook (1990, 164), "the canon is, as it were, absorbed into the texture of the music – it is there, but one doesn’t easily hear it." Even more elusive is the following passage from Brahms’ Intermezzo op 118 No. 4 (1893), where the left hand shadows the right at the time distance of one beat and at the pitch interval of an octave lower:
Michael Musgrave (1985, 262) writes that this piece is "of and anxious, suppressed nature, a quality arising from its strict use of canon at the octave… in the central section this tension is temporarily eased through a very contained passage which employs the canon in chordal terms between the hands."
Types of canon
Considering the many types of canon "in the tonal repertoire", it may be ironic that "canon – the strictest type of imitation – has such a wide variety of possibilities" (Davidian 2015, 136). 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.
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).
Retrograde or crab canon
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. 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.
Additional types include the spiral canon, accompanied canon, and double or triple canon. A double canon is a canon with two simultaneous themes, a triple canon has three.
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). Peter Maxwell Davies was another post-tonal composer who favoured rhythmic canons, where the pitch materials are not obliged to correspond (Scholes, Nagley, and Whittall n.d.).
A puzzle canon, riddle canon, or enigma canon is a canon in which only one voice is notated and the rules for determining the remaining parts and the time intervals of their entrances must be guessed (Merriam-Webster n.d.). "The enigmatical character of a [puzzle] canon does not consist of any special way of composing it, but only of the method of writing it down, of which a solution is required" (Richter 1888, 38). Clues hinting at the solution may be provided by the composer, in which case the term "riddle canon" can be used (Scholes, Nagley, and Whittall n.d.). J S Bach presented many of his canons in this form, for example in The Musical Offering. Mozart, after solving Father Martini's puzzles (Zaslaw and Cowdery 1990, 98), composed his own riddles using Latin epigrams such as "Sit trium series una" and "Ter ternis canite vocibus" ("Let there be one series of three parts" and "sing three times with three voices") (Karhausen 2011, 151).
Other notable contributors to the genre include Ciconia, Ockeghem, Byrd, Beethoven, Brumel; Busnois, Haydn, Josquin des Prez, Mendelssohn, Pierre de la Rue, Brahms, Schoenberg, Nono and Maxwell Davies (Carvalho 1999, 38–39; Davidian 2015, 136; Davies 1971; Davies 1972; Hartmann 1989, passim; Hewett 1957, passim; Johnson 1994, 162–63; Jones 2009, 152; Leven 1948, 361; Litterick 2000, 388; Mann, Wilson, and Urquhart n.d.; Morley 1597, 173, 176; Perkins 2001; Tatlow 1991, 15, 126; Todd 2003, 165; van Rij 2006, 215; Watkins 1986, 239). According to Oliver B. Ellsworth, the earliest known enigma canon appears to be an anonymous ballade, En la maison Dedalus, found at the end of a collection of five theory treatises from the third quarter of the fourteenth century collected in the Berkeley Manuscript (Ciconia 1993, 411n12).
Thomas Morley complained that sometimes a solution, "which being founde (it might bee) was scant worth the hearing" (Morley 1597, 104, cited, inter al., by Barrett 2014, 123). J. G. Albrechtsberger admits that, "when we have traced the secret, we have gained but little; as the proverb says, 'Parturiunt montes, etc.'" but adds that, "these speculative passages...serve to sharpen acumen" (Albrechtsberger 1855, 234).
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.).
J S Bach: Canon per augmentationem contrario motu
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- 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)
- Puzzle Canon website
- Animated graphical scores of canons by Pachelbel, Bach, et al.