Polyrhythm (/ˈpɒlirɪðəm/) is the simultaneous use of two or more rhythms that are not readily perceived as deriving from one another, or as simple manifestations of the same meter. The rhythmic layers may be the basis of an entire piece of music (cross-rhythm), or a momentary section. Polyrhythms can be distinguished from irrational rhythms, which can occur within the context of a single part; polyrhythms require at least two rhythms to be played concurrently, one of which is typically an irrational rhythm. Concurrently in this context means within the same rhythmic cycle. The underlying pulse, whether explicit or implicit can be considered one of the concurrent rhythms. For example, the son clave is poly-rhythmic because its 3 section suggests a different meter from the pulse of the entire pattern.
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👉 Polyrhythm in the context of Jazz
Jazz is a music genre that originated in the African-American communities of New Orleans, Louisiana, in the late 19th and early 20th centuries. Its roots are in blues, ragtime, European harmony, African rhythmic rituals, spirituals, hymns, marches, vaudeville song, and dance music. Since the 1920s Jazz Age, it has been recognized as a major form of musical expression in traditional and popular music. Jazz is characterized by swing and blue notes, complex chords, call and response vocals, polyrhythms and improvisation.
As jazz spread around the world, it drew on national, regional, and local musical cultures, which gave rise to different styles. New Orleans jazz began in the early 1910s, combining earlier brass band marches, French quadrilles, biguine, ragtime and blues with collective polyphonic improvisation. However, jazz did not begin as a single musical tradition in New Orleans or elsewhere. In the 1930s, arranged dance-oriented swing big bands, Kansas City jazz (a hard-swinging, bluesy, improvisational style), and gypsy jazz (a style that emphasized musette waltzes) were the prominent styles. Bebop emerged in the 1940s, shifting jazz from danceable popular music toward a more challenging "musician's music" which was played at faster tempos and used more chord-based improvisation. Cool jazz developed near the end of the 1940s, introducing calmer, smoother sounds and long, linear melodic lines.
Polyrhythm in the context of Music history of the United States
Music history of the United States includes many styles of folk, popular and classical music. Some of the best-known genres of American music are rhythm and blues, jazz, rock and roll, rock, soul, hip hop, pop, and country.
American music began with the Native Americans, the first people to populate North America. With the colonization of America from European countries like France, Spain, Scotland, England, Ireland, and Wales came Christian choirs, musical notation, broadsides, as well as West African slaves. Slaves played a variety of instruments, especially drums and string instruments similar to the banjo. The Spanish also played a similar instrument called the Bandora. Both of these cultures introduced polyrhythms and call-and-response style vocals.
Polyrhythm in the context of Charles Ives
Charles Edward Ives (/aɪvz/; October 20, 1874 – May 19, 1954) was an American modernist composer, actuary and businessman. Ives was among the earliest renowned American composers to achieve recognition on a global scale. His music was largely ignored during his early career, and many of his works went unperformed for many years. Later in life, the quality of his music was publicly recognized through the efforts of contemporaries like Henry Cowell and Lou Harrison, and he came to be regarded as an "American original". He was also among the first composers to engage in a systematic program of experimental music, with musical techniques including polytonality, polyrhythm, tone clusters, aleatory elements, and quarter tones. His experimentation foreshadowed many musical innovations that were later more widely adopted during the 20th century. Hence, he is often regarded as the leading American composer of art music of the 20th century.
Sources of Ives's tonal imagery included hymn tunes and traditional songs; he also incorporated melodies of the town band at holiday parade, the fiddlers at Saturday night dances, patriotic songs, sentimental parlor ballads, and the melodies of Stephen Foster.
Polyrhythm in the context of Music of Africa
The continent of Africa and its music is vast and highly diverse, with different regions and nations maintaining distinct musical traditions. African music includes genres such as makwaya, highlife, mbube, township music, jùjú, fuji, jaiva, afrobeat, afrofusion, mbalax, Congolese rumba, soukous, ndombolo, makossa, kizomba, and taarab, among others. African music also uses a wide variety of instruments from across the continent. The music and dance traditions of the African diaspora, shaped to varying degrees by African musical traditions, include American genres such as Dixieland jazz, blues, and jazz, as well as Caribbean styles such as calypso (see kaiso), and soca. Latin American music genres including cumbia, salsa, son cubano, rumba, conga, bomba, samba, and zouk developed from the music of enslaved Africans and have, in turn, influenced contemporary African popular music.
Like the music of Asia, India, and the Middle East, African music is highly rhythmic. Its complex rhythmic patterns often involve one rhythm played against another to create a polyrhythm. A common example is the three-against-two rhythm, comparable to a triplet played against straight notes. Sub-Saharan African music traditions frequently rely on a wide array of percussion instruments, including xylophones, djembes, drums, and tone-producing instruments such as the mbira or "thumb piano".