Probability theory is a branch of mathematics that deals with calculating the likelihood of a given event’s occurrence, which is expressed as a number between 1 and 0. (Source: http://whatis.techtarget.com/definition/0,,sid9_gci549076,00.html)
See also:
Formalism, Stochastic MusicBibliography: ASUAR, José Vicente (1972a). Música con Computadores: ¿cómo hacerlo..? (Music with computers: how to do it..?)
Burton, Anthony R., Vladimirova, Tanya (1999). Generation of Musical Sequences with Genetic Techniques
Chang, Jae Ho (1999). Composing Noise
McAlpine, Kenneth, Miranda, Eduardo, Hoggar, Stuart (1999). Making Music with Algorithms: A Case-Study System
XENAKIS, Iannis (1958). Auf der Suche nach einer Stochastischen Musik (In search of a stochastic Music)
XENAKIS, Iannis (1960/1961). Grundlagen einer stochastischen Musik (Elements of Stochastic Music)
XENAKIS, Iannis (1966). Zu einer Philosophie der Musik (Towards a philosophy of music)
ZARIPOV, Rudolf Chafizovic (1985). Musica con il calcolatore. Le regole matematiche della composizione (Music with computers. The mathematical rules of composition - second edition)

