regarding musical use: b. Mus. Applied (orig. by Yannis Xenakis (b. 1922), Romanian-born Greek composer) to music in which the overall sound structure is determined, but internal details are left to chance or are established mathematically by composer or computer (by the laws of probability or otherwise).

regarding 'stochistic': it seems apt that I should leave your random misspell for a spell, wordmiss.