music in which composers leave certain elements unspecified, allowing them to be determined by the performers or other circumstances, is called chance music.
Aleatoric music, also known as aleatory music or chance music (from the Latin word alea, which means "dice"), is music in which a compositional element is left to chance and/or a performer decides on a key component of how the piece will be realised (s). The phrase is most frequently used in reference to processes where the element of chance only affects a small number of potential outcomes.
Werner Meyer-lectures Eppler's at the Darmstadt International Summer Courses for New Music at the start of the 1950s introduced the phrase to European composers. "A process is considered to be aleatoric... if its course is determined in principle but reliant on chance in particular," reads his definition.
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