Aleatoric music

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This term has been covered by the website Wikipedia as "Aleatoric Music"

This mediawiki site, a `wiki dictionary` about the nature and practice of free improvisation declines to duplicate that listing. An introduction is presented - a simple copy and paste. from Wikipedia, then a link to the Wikipedia entry.

Introduction, copied from Wikipedia

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, and/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.

The term became known to European composers through lectures by acoustician Werner Meyer-Eppler at the Darmstadt International Summer Courses for New Music in the beginning of the 1950s. According to his definition, "a process is said to be aleatoric ... if its course is determined in general but depends on chance in detail" (Meyer-Eppler 1957, 55). Through a confusion of Meyer-Eppler's German terms Aleatorik (noun) and aleatorisch (adjective), his translator created a new English word, "aleatoric" (rather than using the existing English adjective "aleatory"), which quickly became fashionable and has persisted (Jacobs 1966). More recently, the variant "aleatoriality" has been introduced (Roig-FrancolĂ­ 2008, 340).

Link to Wikipedia page

https://en.wikipedia.org/wiki/Aleatoric_music