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The term polytempo or polytempic is used to describe music in which two or more tempi occur simultaneously.〔(Collections of articles; Greschak, John )〕 In the Western world, the practice of polytempic music has its roots in the music theory of Henry Cowell,〔Henry Cowell, With contributions by David Nicholls, ''New Musical Resources'', , Cambridge University Press, 1996 (original text by Henry Cowell published in 1930), ISBN 978-0-521-49974-3〕 and the early practices of Charles Ives. Later on, composer Elliott Carter, in the fifties, began polymetric experiments in his string quartets that inevitably amounted to polytempic behavior by nature of several competing lines at different surface speeds. At around the same time, composer Henry Brant expanded on Ives Unanswered Question to create a spatial music in which entire ensembles, separated by vast distances, play in distinct simultaneous tempi. Some types of African drumming exhibit this phenomenon. Today's composers are employing polytempi as a compositional strategy to create total and complete independence of line in polyphonic music. Composers such as Conlon Nancarrow, David A. Jaffe, Evgeni Kostitsyn, Kyle Gann, Kenneth Jonsson, John Arrigo-Nelson, Brian Ferneyhough, Karlheinz Stockhausen, Frank Zappa, and Peter Thoegersen have used various methods in achieving polytempic effects in their music. Polytempic music also harkens to the rhythmic practices of some Renaissance and medieval composers (see hemiola). ==Multitemporal music== Multitemporal music is composed using sound streams that have different internal tempi or pulse speed, for example one part at 115 bpm and at 105 bpm at the same time. Multitemporal music was first heard in US-Mexican composer Conlon Nancarrow's work, discovered by Hungarian György Ligeti, who undertook the task of bringing Nancarrow's music to the fore. To overcome the limits posed by a human performer in playing a multitemporal score Nancarrow used two modified player-pianos, punching the rolls by hand. One of the few recordings of this composer's work is found in Wergo's "Studies for Player Piano' series. The idea was then proposed by Iannis Xenakis in the early seventies and more recently by Italian born composer Valerio Camporini Faggioni using synthetic and software devices. In 1985, György Ligeti composed a piano etude ("Désordre") that achieves the effect of polytempo using only one performer by employing a gridwork of constant durational values as a background upon which the two hands of the pianist perform longer durational values that contract and expand at different rates. Rather than having to focus attention on two tempi at once, the pianist can focus only upon the background, perceiving and performing notes of two temporally contrasting melodies as accents upon it. A similar technique, with the tempi similar to each other is Rhythm Phasing - a technique introduced by Steve Reich and used especially in minimalist and post minimalist music. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polytempo」の詳細全文を読む スポンサード リンク
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