We can control continuous transformations of large sets of granular and/or continuous sounds. In fact densities, durations, registers, speeds etc... can all be subjected to the law of large numbers with the necessary approximations. We can therefore with the aid of means and deviations shape these sets and make them evolve in different directions. The best known is that which moves from order to disorder, or vice versa, it is that which introduces the concept of entropy.

After the first unfolding of a series of twelve sounds of the tempered scale, the unpredictability has fallen to zero, the constraint is maximum, the choice is nil, and the entropy is zero. Richness and hence interest are displaced to other fields, such as harmonies, timbres and durations, and many other compositional wiles are aimed at reviving entropy. In fact sonic discourse is nothing but the perpetual fluctuations of entropy in all its forms.

- Xenakis quotes, Nouritza Matossian (1986)