Aleatoric music (also referred to as indeterminacy) is an attempt to omit the composer from the compositional process... usually leaving it to chance. John Cage, who "invented" it, often used mathematical equations to create a piece of music. However, he used other methods as well. In his work, Variations IV (1965), he used motion sensor light beams during a ballet, which were triggered by dancers when they moved across them. When this happened, prerecorded electronic pieces and live field recordings were played.
Some people might say that aleatoric music can be found simply by going outside and listening to the sounds around you. Either way, I'm sure you get the idea.
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