In music, counterpoint is the relationship between voices that are harmonically interdependent (polyphony), but independent in rhythm and contour. It has been most commonly identified in classical music, developing strongly during the Renaissance and in much of the common practice period, especially in Baroque music. The term originates from the Latin punctus contra punctum meaning "point against point".
General principles 
In its most general aspect, counterpoint involves the writing of musical lines that sound very different and move independently from each other but sound harmonious when played simultaneously. In each era, contrapuntally organized music writing has been subject to rules, sometimes strict. By definition, chords occur when multiple notes sound simultaneously; however, harmonic, "vertical" features are considered secondary and almost incidental when counterpoint is the predominant textural element. Counterpoint focuses on melodic interaction—only secondarily on the harmonies produced by that interaction. In the words of John Rahn:
It is hard to write a beautiful song. It is harder to write several individually beautiful songs that, when sung simultaneously, sound as a more beautiful polyphonic whole. The internal structures that create each of the voices separately must contribute to the emergent structure of the polyphony, which in turn must reinforce and comment on the structures of the individual voices. The way that is accomplished in detail is...'counterpoint'.
In the modern period, where polytonality and atonality were introduced; Glenn Gould's String Quartet in F minor, Opus 1, for example, is "an idiosyncratic synthesis of idioms including Baroque fugue, Classical sonata form, Strauss's late-Romantic harmony, and Schoenberg's 'developing variation'".
Species counterpoint 
Species counterpoint generally offers less freedom to the composer than other types of counterpoint, and is therefore a so-called strict counterpoint. Species counterpoint was developed as a pedagogical tool, in which a student progresses through several "species" of increasing complexity, with a very simple part that does not change known as the cantus firmus (Latin for "fixed melody"). The student gradually attains the ability to write free counterpoint (that is, less rigorously constrained counterpoint, usually without a cantus firmus) according to the rules at the given time. The idea is at least as old as 1532, when Giovanni Maria Lanfranco described a similar concept in his Scintille di musica (Brescia, 1533). The 16th century Venetian theorist Zarlino elaborated on the idea in his influential Le institutioni harmoniche, and it was first presented in a codified form in 1619 by Lodovico Zacconi in his Prattica di musica. Zacconi, unlike later theorists, included a few extra contrapuntal techniques as species, for example invertible counterpoint.
- Note against note;
- Two notes against one;
- Four (extended by others to include three, or six, etc.) notes against one;
- Notes offset against each other (as suspensions);
- All the first four species together, as "florid" counterpoint.
A succession of later theorists imitated Fux's seminal work quite closely, but often with some small and idiosyncratic modifications in the rules. A good example is Luigi Cherubini.[not in citation given]
Considerations for all species 
The following rules apply to melodic writing in each species, for each part:
- The final must be approached by step. If the final is approached from below, the leading tone must be raised in a minor key (Dorian), except in the case of the Phrygian mode. Thus, in the Dorian mode on D, a C♯ is necessary at the cadence.
- Permitted melodic intervals are the perfect fourth, fifth, and octave, as well as the major and minor second, major and minor third, and ascending minor sixth. When the ascending minor sixth is used it must be immediately followed by motion downwards.
- If writing two skips in the same direction—something that must be done only rarely—the second must be smaller than the first, and the interval between the first and the third note may not be dissonant.
- If writing a skip in one direction, it is best to proceed after the skip with motion in the other direction.
- The interval of a tritone in three notes is to be avoided (for example, an ascending melodic motion F - A - B natural), as is the interval of a seventh in three notes.
- There must be a climax or high point in the line countering the Cantus firmus. This usually occurs somewhere in the middle of exercise and must occur on a strong beat.
- An outlining of a seventh is avoided within a single line moving in the same direction.
And, in all species, the following rules apply concerning the combination of the parts:
- The counterpoint must begin and end on a perfect consonance.
- Contrary motion should predominate.
- Perfect consonances must be approached by oblique or contrary motion
- Imperfect consonances may be approached by any type of motion
- The interval of a tenth should not be exceeded between two adjacent parts, unless by necessity.
- Build from the bass, upward.
First species 
In first species counterpoint, each note in every added part (parts being also referred to as lines or voices) sounds against one note in the cantus firmus. Notes in all parts are sounded simultaneously, and move against each other simultaneously.
In the present context, a "step" is a melodic interval of a half or whole step. A "skip" is an interval of a third or fourth. (See Steps and skips.) An interval of a fifth or larger is referred to as a "leap".
A few further rules given by Fux, by study of the Palestrina style, and usually given in the works of later counterpoint pedagogues, are as follows.
- Begin and end on either the unison, octave, or fifth, unless the added part is underneath, in which case begin and end only on unison or octave.
- Use no unisons except at the beginning or end.
- Avoid parallel fifths or octaves between any two parts; and avoid "hidden" parallel fifths or octaves: that is, movement by similar motion to a perfect fifth or octave, unless one part (sometimes restricted to the higher of the parts) moves by step.
- Avoid moving in parallel fourths. (In practice Palestrina and others frequently allowed themselves such progressions, especially if they do not involve the lowest of the parts.)
- Avoid moving in parallel thirds or sixths for very long.
- Attempt to keep any two adjacent parts within a tenth of each other, unless an exceptionally pleasing line can be written by moving outside of that range.
- Avoid having any two parts move in the same direction by skip.
- Attempt to have as much contrary motion as possible.
- Avoid dissonant intervals between any two parts: major or minor 2nd, major or minor 7th, any augmented or diminished interval, and perfect fourth (in many contexts).
Second species 
In second species counterpoint, two notes in each of the added parts work against each longer note in the given part.
Additional considerations in second species counterpoint are as follows, and are in addition to the considerations for first species:
- It is permissible to begin on an upbeat, leaving a half-rest in the added voice.
- The accented beat must have only consonance (perfect or imperfect). The unaccented beat may have dissonance, but only as a passing tone, i.e. it must be approached and left by step in the same direction.
- Avoid the interval of the unison except at the beginning or end of the example, except that it may occur on the unaccented portion of the bar.
- Use caution with successive accented perfect fifths or octaves. They must not be used as part of a sequential pattern.
Third species 
In third species counterpoint, four (or three, etc.) notes move against each longer note in the given part.
There are three special figures introduced into 3rd species which will later be added to fifth species and ultimately outside of the restrictions of "species writing." There are three figures to consider: The Nota Cambiata, Double Neighbor Tones, and Double Passing Tones. Double Neighbor Tones: The figure is prolonged over four beats and allows special dissonances. The upper and lower tones are prepared on beat 1 and resolved on beat 4. The 5th note or downbeat of the next measure should move by step in the same direction as the last two notes of the double neighbor figure. Lastly a double passing tone allows two dissonant passing tones in a row. The figure would consist of 4 notes moving in the same direction by step. The two notes that allow dissonance would be beat 2 and 3 or 3 and 4. The dissonant interval of a 4th would proceed into a diminished 5th and the next note would resolve at the interval of a 6th. 
Fourth species 
In fourth species counterpoint, some notes are sustained or suspended in an added part while notes move against them in the given part, often creating a dissonance on the beat, followed by the suspended note then changing (and "catching up") to create a subsequent consonance with the note in the given part as it continues to sound. As before, fourth species counterpoint is said to be expanded when the added-part notes vary in length among themselves. The technique requires chains of notes sustained across the boundaries determined by beat, and so creates syncopation. Also it is important to note that a dissonant interval is allowed on beat 1 because of the syncopation created by the suspension
Fifth species (florid counterpoint) 
In fifth species counterpoint, sometimes called florid counterpoint, the other four species of counterpoint are combined within the added parts. In the example, the first and second bars are second species, the third bar is third species, the fourth and fifth bars are third and embellished fourth species, and the final bar is first species.
Contrapuntal derivations 
Since the Renaissance period in European music, much contrapuntal music has been written in imitative counterpoint. In imitative counterpoint, two or more voices enter at different times, and (especially when entering) each voice repeats some version of the same melodic element. The fantasia, the ricercar, and later, the canon and fugue (the contrapuntal form par excellence) all feature imitative counterpoint, which also frequently appears in choral works such as motets and madrigals. Imitative counterpoint spawned a number of devices that composers use to give their works both mathematical rigor and expressive range. These devices include:
- The inverse of a given fragment of melody is the fragment turned upside down—so if the original fragment has a rising major third (see interval), the inverted fragment has a falling major (or perhaps minor) third, etc. (Compare, in twelve tone technique, the inversion of the tone row, which is the so-called prime series turned upside down.) (Note: in invertible counterpoint, including double and triple counterpoint, the term inversion is used in a different sense altogether. At least one pair of parts is switched, so that the one that was higher becomes lower. See Inversion in counterpoint; it is not a kind of imitation, but a rearrangement of the parts.)
- whereby an imitative voice sounds the melody backwards in relation the leading voice.
- where the imitative voice sounds the melody backwards and upside-down at once.
- when in one of the parts in imitative counterpoint the note values are extended in duration compared to the rate at which they were sounded when introduced.
- when in one of the parts in imitative counterpoint the note values are reduced in duration compared to the rate at which they were sounded when introduced.
Linear counterpoint 
Linear counterpoint is "a purely horizontal technique in which the integrity of the individual melodic lines is not sacrificed to harmonic considerations. The voice parts move freely, irrespective of the effects their combined motions may create." In other words, either "the domination of the horizontal (linear) aspects over the vertical" is featured or the "harmonic control of lines is rejected."
Associated with neoclassicism, the first work to use the technique is Stravinsky's Octet (1923), inspired by Bach and Palestrina. However, according to Knud Jeppesen: "Bach's and Palestrina's points of departure are antipodal. Palestrina starts out from lines and arrives at chords; Bach's music grows out of an ideally harmonic background, against which the voices develop with a bold independence that is often breath-taking."
According to Cunningham, linear harmony is "a frequent approach in the 20th-century...[in which lines] are combined with almost careless abandon in the hopes that new 'chords' and 'progressions,'...will result." It is possible with "any kind of line, diatonic or duodecuple." A notable example of linear counterpoint in the 20th century is Glenn Gould's String Quartet in F minor, Opus 1.[not in citation given]
Dissonant counterpoint 
Dissonant counterpoint was originally theorized by Charles Seeger as "at first purely a school-room discipline," consisting of species counterpoint but with all the traditional rules reversed. First species counterpoint is required to be all dissonances, establishing "dissonance, rather than consonance, as the rule," and consonances are "resolved" through a skip, not step. He wrote that "the effect of this discipline" was "one of purification." Other aspects of composition, such as rhythm, could be "dissonated" by applying the same principle (Charles Seeger, "On Dissonant Counterpoint," Modern Music 7, no. 4 (June–July 1930): 25-26).
Seeger was not the first to employ dissonant counterpoint, but was the first to theorize and promote it. Other composers who have used dissonant counterpoint, if not in the exact manner prescribed by Charles Seeger, include Ruth Crawford-Seeger, Carl Ruggles, Henry Cowell, Henry Brant, Dane Rudhyar, Lou Harrison, Fartein Valen, and Arnold Schoenberg.
Contrapuntal radio 
Glenn Gould used what he considered a kind of counterpoint in his three radio documentaries: The Idea of North, The Latecomers, and The Quiet in the Land (see The Solitude Trilogy). Gould called this method "contrapuntal radio." It involves the voices of two or more people simultaneously speaking (or playing against each other), entering and leaving the work as in a fugue.
See also 
- Rahn, John (2000). Music Inside Out: Going Too Far in Musical Essays. intro. and comment. by Benjamin Boretz. Amsterdam: G+B Arts International. p. 177. ISBN 90-5701-332-0. OCLC 154331400.
- http://www.thecanadianencyclopedia.com/articles/emc/glenn-gould, "Glenn Gould the Composer and Conductor"
- Jeppesen, Knud (1992) . Counterpoint: the polyphonic vocal style of the sixteenth century. trans. by Glen Haydon, with a new foreword by Alfred Mann. New York: Dover. ISBN 0-486-27036-X.
- Cherubini, Luigi (1835). Cours de contrepoint et de fugue. with Fromental Halévy. Paris: M. Schlesinger. OCLC 11909698.
- "Counterpoint in Composition"
- Salzer/Schacter. Counterpoint in Composition:The Study of Voice Leading. Stanley Persky, City University of New York. ISBN 023107039X.
- Katz, Adele (1946). Challenge to Musical Tradition: A New Concept of Tonality (New York: A.A. Knopf), p.340. Reprinted New York: Da Capo Press, 1972; reprinted n.p.: Katz Press, 2007, ISBN 1-4067-5761-6.
- Ulrich, Homer (1962). Music: a Design for Listening, second edition (New York: Harcourt, Brace & World), p.438.
- Cunningham, Michael (2007). Technique for Composers, p.144. ISBN 1-4259-9618-3.
- Spilker, John D., "Substituting a New Order": Dissonant Counterpoint, Henry Cowell, and the network of ultra-modern composers, Ph.D. dissertation, Florida State University, 2010.
Further reading 
- Kurth, Ernst (1991). "Foundations of Linear Counterpoint". In Ernst Kurth: Selected Writings, selected and translated by Lee Allen Rothfarb, foreword by Ian Bent,[page needed]. Cambridge Studies in Music Theory and Analysis 2. Cambridge and New York: Cambridge University Press. Paperback reprint 2006. ISBN 0-521-35522-2 (cloth); ISBN 0-521-02824-8 (pbk)
|Wikisource has the text of the 1911 Encyclopædia Britannica article Contrapuntal forms.|
- An Introduction to Species Counterpoint
- ntoll.org: Species Counterpoint by Nicholas H. Tollervey
- Principles of Counterpoint by Alan Belkin
- Orima: The History of Experimental Music in Northern California: On Dissonant Counterpoint by David Nicholls from his American Experimental Music: 1890-1940
- Virginia Tech Multimedia Music Dictionary: Dissonant counterpoint examples and definition
- De-Mystifying Tonal Counterpoint or How to Overcome Your Fear of Composing Counterpoint Exercises by Christopher Dylan Bailey, composer at Columbia University
- Counterpointer:Software tutorial for the study of counterpoint by Jeffrey Evans
- "Bach as Contrapuntist" by Dan Brown, music critic from Cornell University, from his web book Why Bach?
- "contrapuntal - a collaborative arts project by Benjamin Skepper"