Michael Snow

Process music is a movement in which a composition is generated by a clearly defined procedure or rule-set. Sometimes this procedure is made audible—so the listener can follow the gradual changes as they unfold—and sometimes the process remains hidden behind the surface of the sound. Typical processes include phasing (two identical patterns drifting out of sync), additive or subtractive procedures (expanding or contracting a pattern by fixed steps), iterative feedback (repeating an operation so the output becomes the next input), permutations, stochastic or probabilistic rules, or instruction-based performance systems. The aesthetic ranges from hypnotic and pulse-driven to fragile and static, but the core idea remains: the music arises from the process.

Experimental music is an umbrella term for practices that prioritize exploration, process, and discovery over adherence to established genre norms. It embraces new sound sources, nonstandard tuning systems, indeterminacy and chance operations, graphic and open-form scores, extended techniques, and technology-led sound design (tape, electronics, computers, and live processing). Rather than a single style, it is a methodology and ethos: testing hypotheses about sound, structure, and performance, often blurring boundaries between composition, improvisation, sound art, and performance art. Listeners can expect unfamiliar timbres, unusual forms, and an emphasis on how music is made as much as the resulting sound.

Radio broadcast recordings are archival or off-air captures of live radio programs, ranging from music performances and variety shows to news bulletins, drama, comedy, and DJ airchecks. They include studio sessions performed specifically for radio (often recorded to transcription discs or tape), as well as direct off-air recordings made by engineers, collectors, or the stations themselves. The sound can vary from band-limited, mono, lo‑fi captures to surprisingly high-fidelity transcriptions, depending on era and medium. Culturally, these recordings preserve the immediacy and ephemerality of radio: sponsor read‑outs, station IDs, vintage jingles, crowd reactions, and unedited presenter patter. They are invaluable to historians and reissue labels, and they inspire modern sample-based styles that mine their nostalgia, texture, and institutional aura.