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.