Indeterminate music was a form of music pioneered by the late John Cage. It involves music in which some or all of the compositional and performance parameters are left to chance. Wikibooks Wikiversity has more about this subject: School of Music Look up Music in Wiktionary, the free dictionary Wikicities has a wiki about Music: Music Music City : a collaborative music database All Music Guide: includes a comprehensive and flexible Genre and Style system MusicWiki: A Collaborative Music-related encyclopedia Science... John Cage John Milton Cage (September 5, 1912–August 12, 1992) was an American experimental music composer and writer. ... Chance can be used in any of the following contexts: Probability Luck Randomness Chance is also a 2002 movie starring Amber Benson. ...

The chance in the music may, for example, consist of the ambient sounds at a venue, the number of performers, the length of the piece and so on.

See Stochastic music and aleatoric music. Stochastic, from the Greek stochos or goal, means of, relating to, or characterized by conjecture; conjectural; random. ... Aleatoric (or aleatory) music or composition, is music where some element of the composition is left to chance. ...