Percussions de Strasbourg

Stochastic music is a 20th‑century avant‑garde approach in which musical parameters are governed by probability theory and random processes rather than fixed, note‑by‑note determination. Instead of traditional melody and harmony, composers shape "sound masses" by controlling statistical features like density, event rate, pitch distributions, durations, and dynamics. Typical tools include Gaussian, Poisson, and Markov processes, which create evolving textures, swarms, and clouds of sound—often realized in both orchestral and electroacoustic settings. The term is most closely associated with Iannis Xenakis, who formalized the method and demonstrated it in landmark works and writings, but it has deeply influenced computer music, experimental electronic practices, and later microsound/granular approaches.

Avant-garde music is an umbrella term for boundary-pushing practices that challenge prevailing norms of harmony, rhythm, timbre, form, and performance. It privileges experimentation, conceptual rigor, and a willingness to reframe what counts as music at all. Historically tied to early 20th‑century artistic modernism, avant-garde music introduced atonality, the emancipation of noise, and new forms of notation and process. It embraces indeterminacy, extended techniques, electronics, spatialization, and multimedia performance, treating sound as material to be sculpted, questioned, and reinvented.