Entropy has roots in physics and in communications theory. More generally, entropy means a process in which order deteriorates with the passage of time. In music, entropy concerns the amount of chaos, whether composed or perceived, within one or more musical parameters at a given moment.
Bibliography: XENAKIS, Iannis (1958). Auf der Suche nach einer Stochastischen Musik
XENAKIS, Iannis (1960-1961). Grundlagen einer stochastischen Musik
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