Answer: chance music is just another word for Aleatoric music
Among notable aleatory works are Music of Changes (1951) for piano and Concert for Piano and Orchestra (1958), by the American composer John Cage, and Klavierstück XI (1956; Keyboard Piece XI), by Karlheinz Stockhausen of Germany.
Aleatoric/Chance music is music in which either composition or method of performance is determined by elements of chance or unpredictability. Music composed by the random selection of pitches and rhythms. Frequently found in some professional opera choruses.
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).
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