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Polyrhythm is the simultaneous sounding of two or more independent rhythms. A simple example of a polyrhythm is 3 evenly-spaced notes against 2, with the 3-beat pattern being faster than the 2-beat pattern, so that they both take the same amount of time. Other simple polyrhythms are 3:4, 4:3, 5:4, 7:4, etc. Another form of polyrhythm, which might also be termed polymeter, would be phrasing to suggest a different meter than the one being played by the rest of the ensemble. A common example of this in jazz would be phrasing quarter notes in groupings of 3 to suggest 3/4 time while the ensemble plays in 4/4. Compare with hemiola (not a polyrhythm). Traditional African music is heavily polyrhythmic, although, unlike below, the downbeats do not usually coincide. Frank Zappa, especially towards the end of his career, experimented a lot with complex polyrhythms, such as 11:17, and even nested polyrhythms. The metal band Meshuggah also have some polyrhythms in their music, although their quirkiness is mostly of a polymetric nature. Much minimalist and totalist music makes extensive use of polyrhythms. Henry Cowell and Conlon Nancarrow created music with yet more complex polytempo and using irrational numbers like pi: e. Common polyrhythms found in jazz are 3:2, which manifests as the quarter-note triplet; 2:3, usually in the form of dotted-quarter notes against quarter notes; 4:3, played as dotted-eight notes against quarter notes (this one demands a good deal of technical proficiency to pull off, and was not at all common in jazz before Tony Williams used it when playing with Miles DavisMiles Davis ( May 26, 1926 September 28, 1991) was an American jazz composer, trumpeter and multi-instrumentalist and was one of the most influential, innovative and original musicians of the twentieth century. In terms of importance to the history of jaz; and finally 3/4 time against 4/4, which along with 2:3 was used famously by Elvin JonesElvin Ray Jones ( September 9, 1927 May 18, 2004) was a jazz drummer. He was born in Pontiac, Michigan, the youngest child in a family of ten. His father worked for General Motors. Two of Jones' brothers were also jazz musicians: Hank ( piano), and Thad ( and McCoy TynerMcCoy Tyner is a jazz pianist (born December 11, 1938 in Philadelphia). Tyner is best known as the pianist for the John Coltrane Quartet, which also consisted, along with Coltrane, of Jimmy Garrison (bass) and Elvin Jones (drums). The quartet toured almos playing with John ColtraneJohn Coltrane ( September 23, 1926 July 17, 1967) was a famous jazz saxophonist. Early life Born in Hamlet, North Carolina, Coltrane grew up in High Point, North Carolina and moved to Philadelphia, Pennsylvania in June 1943. He was inducted into the Navy.
1 Examples
The following is an example of a 2 against 3 polyrhythm, given in time unit box systemTime Unit Box System TUBS is a simple system for notating events that happen over a period of time. This system is mostly used for notating rhythms in music. The notation consists of one or more rows of boxes; each box represents a fixed unit of time. (TUBS) notation; each box represents a fixed unit of time; time progresses from the left of the diagram to the right, although this is irrelevant since the pattern is symmetric. Beats are indicated with an X; rests are indicated with a blank.
2 against 3 polyrhythm
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| 3-beat rhythm |
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A common memory aid to help with the 2 against 3 polyrhythm is that it has the same rhythm as the phrase "not difficult"; the simultaneous beats occur on the word "not"; the second and third of the triple beat land on "dif" and "cult", respectively. The second 2-beat lands on the "fi" in "difficult." Try saying "not difficult" over and over in time with the sound file below. Another phrase with the same rhythm is "cold cup of tea":
Similar phrases for the 3 against 4 polyrhythm are "pass the gosh darn butter" and "what atrocious weather"; The 3 against 4 polyrhythm is shown below.
3 against 4 polyrhythm
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| 4-beat rhythm |
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As can be seen from above, the counting for polyrhythms is determined by the lowest common multipleIn arithmetic and number theory the least common multiple or lowest common multiple lcm or smallest common multiple of two integers a and b is the smallest positive integer that is a multiple of both a and b''. If there is no such positive integer, e., so if one wishes to count 2 against 3, one needs to count a total of 6 beats, as lcm(2,3) = 6 (123456 and 123456). However this is only useful for very simple or polyrhythms, or for getting a feel for more complex ones, as the total number of beats rises quickly. To count 4 against 5, for example, requires a total of 20 beats, and counting thus slows the tempo considerably. However some players, such as classical Indian musicians, can intuitively play high polyrhythms such as 7 against 8.
Below are some example polyrhythms in MIDI format:
