Jean (Hans) Arp, Collage Arranged According to the Laws of Chance, 1916–17
Purchase © 2002 Artists Rights Society (ARS), New York, VG Bild-Kunst, Bonn

Aleatoric Music (also aleatory music or chance music; from the Latin word alea, meaning “dice“) is music in which some element of the composition is left to chance or some primary element of a composed work’s realization is left to the determination of its performer(s). The term is most often associated with procedures in which the chance element involves a relatively limited number of possibilities.

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