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Aleatoric music
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" . 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 . More recently, the variant "aleatoriality" has been introduced .
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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