music, a cantus firmus ("fixed song") is a pre-existing melodyforming the basis of a polyphonic composition.
The plural of this Latin term is "canti firmi", though one occasionally sees the corrupt form "cantus firmi". The Italian is often used instead: "canto fermo" (and the plural in Italian is "canti fermi").
The earliest polyphonic compositions almost always involved a cantus firmus, typically a
Gregorian chant, although the term itself was not used until the 14th century. [Harvard Dictionary of Music, p. 135.] The earliest surviving polyphonic compositions, in the Musica enchiriadis(around 900 CE), contain the chant in the top voice, and the newly-composed part underneath; however this usage changed around 1100, after which the cantus firmus typically appeared in the lowest-sounding voice. Later, the cantus firmus appeared in the tenor voice (from the Latin verb 'tenere', to hold), singing notes of longer duration, around which more florid lines, instrumental and/or vocal, were composed.
Composition using a cantus firmus continued to be the norm through the 13th century: almost all of the music of the St. Martial and Notre Dame schools uses a cantus firmus, as well as most 13th century
motets. Many of these motets were written in several languages, with the cantus firmus in the lowest voice; the lyrics of love poems might be sung in the vernacular above sacred Latin texts in the form of a trope, or the sacred text might be sung to a familiar secular melody.
In the 14th century, the technique continued to be widely used for most sacred vocal music, although considerable elaboration began to appear: while most continental composers used isorhythmic methods, in England other composers experimented with a "migrant" cantus firmus, in which the tune moved from voice to voice, however without itself being elaborated significantly. Elaborations came later, in what was to be known as the paraphrase technique; this compositional method became important in composition of masses by the late 15th century. (See
cyclic mass, which became the standard type of mass composition around the middle of the 15th century, used cantus firmus technique as its commonest organising principle. At first the cantus firmus was almost always drawn from plainchant, but the range of sources gradually widened to include other sacred sources and even sometimes popular songs. The cantus firmus was at first restricted to the tenor, but by the end of the century many composers experimented with other ways of using it, such as introducing it into each voice as a contrapuntal subject, or using it with a variety of rhythms. During the 16th century the cantus firmus technique began to be abandoned, replaced with the parody (or imitation) technique, in which multiple voices of a pre-existing source were incorporated into a sacred composition such as a mass. Yet while composers in Italy, France, and the Low Countries used the parody and paraphrase techniques, composers in Spain, Portugal, and Germany continued to use the cantus firmus method in nationally idiosyncratic ways. [Gangwere, p. 216.]
Probably the most widely set of the secular cantus firmus melodies was
L'homme armé. Over 40 settings are known, including two by Josquin Desprez, and six by an anonymous composer or composers in Naples, which were intended as a cycle. Many composers of the middle and late Renaissance wrote at least one mass based on this melody, and the practice lasted into the seventeenth century, with a late setting by Carissimi. There are several theories regarding the meaning of the name: one suggests that the "armed man" represents St Michael the Archangel, while another suggests that it refers to the name of a popular tavern (Maison L'Homme Armé) near Dufay's rooms in Cambrai. Being that this music arose shortly after the Fall of Constantinoplein 1453, it is possible that the text "the armed man should be feared" arose from the fear of the Ottoman Turks, who were expanding militarily towards central Europe. There are numerous other examples of secular cantus firmi used for composition of masses; some of the most famous include ' Fortuna Desperata' (attributed to Antoine Busnois), ' Fors seulement' ( Johannes Ockeghem), ' Mille regretz' (Josquin), and ' The western wynde' (anonymous).
German composers in the Baroque period in Germany, notably Bach, used
choralemelodies as cantus firmi. In the opening movement of Bach's St. Matthew Passion, the chorale "O Lamm Gottes, unschuldig" appears in long notes, sung by a separate choir of boys "in ripieno". Many of his chorale preludes include a chorale tune in the pedal part.
As a teaching tool
Using a cantus firmus as a means of teaching
species counterpointwas the basis of "Gradus ad Parnassum" by Johann Joseph Fux, although the method was first published by Girolamo Dirutain 1610. Counterpoint is still taught routinely using a method adapted from Fux, and based on the cantus firmus.
* M. Jennifer Bloxam: "Cantus firmus", Grove Music Online, ed. L. Macy (Accessed November 7, 2006), [http://www.grovemusic.com (subscription access)]
* Sparks, E. H. "Cantus firmus in Mass and Motet", Berkeley, (1963)
* "The New Harvard Dictionary of Music", ed. Don Randel. Cambridge, Massachusetts, Harvard University Press, 1986. ISBN 0-674-61525-5
* Blanche Gangwere, "Music History During the Renaissance Period, 1520–1550". Westport, Connecticut, Praeger Publishers. 2004.
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