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process music

Process Music

United States · 1960s
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Description

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.


Sources: Spotify, Wikipedia, Discogs, RYM, MB, user feedback and other online sources

History

Origins (1960s)

Process music crystallized in the United States in the 1960s, alongside (and overlapping with) musical minimalism. Composers articulated a new priority: design an objective, often simple, procedure and let the piece run. Steve Reich’s manifesto "Music as a Gradual Process" (1968) and works such as It’s Gonna Rain (1965), Come Out (1966), and Piano Phase (1967) made the process audibly traceable through tape-loop and performer phasing. Terry Riley’s In C (1964) established a modular, instruction-based process that performers realize in real time. La Monte Young’s conceptual scores and sustained-tone works introduced durational and instruction-driven systems; Alvin Lucier’s I Am Sitting in a Room (1969) used acoustic feedback as an iterative process.

In Europe, Karlheinz Stockhausen’s “process plan” pieces (e.g., Prozession, Kurzwellen) formalized the idea that transformation rules—not fixed notes—could be a score. Cornelius Cardew and the Scratch Orchestra, as well as systems-oriented British composers, extended instruction and community-based process practices.

Techniques and Notable Subtypes
•   Phasing: identical patterns drift out of sync (Reich; Clapping Music, 1972). •   Additive/Subtractive procedures: patterns grow or shrink by fixed increments (Philip Glass’s early additive works). •   Iteration/Feedback: the output recursively becomes input (Lucier’s room-resonance piece). •   Permutation and Cellular Systems: modules permuted or traversed via rule-sets (Riley’s In C). •   Stochastic/Rule-based: probabilistic operations (in dialogue with Xenakis’s methods) and instruction scores (Cardew, Pauline Oliveros’s Sonic Meditations).
1970s–1980s: Consolidation and Diffusion

Process thinking spread into concert, electroacoustic, and studio practices. Brian Eno’s ambient and generative strategies emphasized long-form systems that unfold with minimal intervention. Michael Nyman popularized the term “systems music,” discussing how audible procedures structure listening.

Legacy and Influence

The process attitude reshaped composition and listening: audiences track change over time rather than event-by-event. It informed ambient and drone aesthetics, sound art and installation, live-electronic and algorithmic practices, and later post-minimal movements (e.g., Totalism). Whether the procedure is overt or covert, process music made “compositional method” a principal musical parameter.

How to make a track in this genre

1) Choose a process

Pick a transparent, repeatable rule the listener can potentially perceive:

•   Phasing: run two identical patterns at slightly different speeds and let them drift in/out of alignment. •   Additive/Subtractive: add or remove one note/rest each cycle. •   Permutation: cycle a fixed pattern through rotations or ordered swaps. •   Iteration/Feedback: re-record or re-perform outputs so each pass transforms the previous one (acoustically or electronically). •   Stochastic/Rule-based: define probabilities for events, dynamics, or entries.
2) Select materials and constraints
•   Start with short, rhythmically clear cells (e.g., a 12–16-note figure in a steady pulse) for audible processes. •   Limit pitch sets (pentatonic or modal) to keep focus on the unfolding procedure. •   Fix a tempo (often steady) and a time grid to clarify change.
3) Encode the system as a score
•   Write instructions, not just notes: “Player B begins the same pattern one eighth-note later and maintains tempo.” •   Provide stopping conditions (number of cycles, duration, or a convergence point). •   For electronic works, script the logic in Max/MSP, SuperCollider, Pure Data, or a DAW with automation.
4) Performance practice
•   Emphasize consistency: steady pulse, even tone, controlled dynamics so the process is audible. •   Use instruments with clear attack for rhythmic clarity (piano, mallet percussion, guitars, clapping, small ensemble winds/strings). For drone-leaning processes, sustained instruments (strings, organ, synths) work well. •   If using feedback/room processes (à la Lucier), test the space and mic/speaker placement to reveal resonances gradually and safely.
5) Shape the listener’s experience
•   Decide whether the process should be obvious (gradual, linear) or hidden (complex, emergent surface). •   Consider formal arcs: start with clear alignment, move to rich complexity, and resolve to a new equilibrium.
6) Common pitfalls and tips
•   If the process is too fast or the cell too busy, change may feel chaotic; slow the rate or simplify the pattern. •   Document parameters so performances remain faithful yet flexible; embrace small performance deviations—they often enrich the texture.

Top albums

Drumming; Music for Mallet Instruments, Voices and Organ; Six Pianos
Drumming; Music for Mallet Instruments, Voices and Organ; Six Pianos
Steve Reich / Steve Reich and Musicians
Africa Express Presents... Terry Riley's In C Mali
Africa Express Presents... Terry Riley's In C Mali
Terry Riley / Africa Express
The Sinking of the Titanic
The Sinking of the Titanic
Gavin Bryars
Femenine
Femenine
Julius Eastman / ensemble 0 / AUM Grand Ensemble
In C
In C
Terry Riley

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Process Music
Process Music
Melodigging
Process Radio
Process Radio
Spotify

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Related labels

Hausu Mountain
Hausu Mountain
fahwa
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in this genre
Influenced by
Experimental
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.
Indeterminacy
Indeterminacy is a strand of post‑war experimental music in which some aspects of a composition are left to chance or to the free choice of the performer, ensuring that no two realizations are exactly the same. The approach encompasses chance procedures used during composition (e.g., tossing coins or consulting the I Ching), open or mobile forms in which sections may be reordered, graphic or text‑based notation that prompts interpretation rather than strict reading, and time‑bracket techniques that specify durations but not exact synchrony. Closely associated with the New York School (John Cage, Earle Brown, Morton Feldman, Christian Wolff), indeterminacy challenged traditional authorship, fixed works, and score‑bound precision by shifting agency to processes and performers. While often conflated with “aleatoric” music, indeterminacy typically denotes unpredictability at the level of performance/realization (open form, variable notation), whereas chance composition may use randomness to create a fixed score. In practice, many works combine both.
Serialism
Serialism is a compositional method in which musical parameters are organized into ordered series that govern a work’s structure. Most famously, twelve‑tone serialism uses an ordered row of the 12 pitch classes, deploying transformations such as prime, inversion, retrograde, and retrograde inversion to avoid traditional tonal hierarchy. While Schoenberg’s twelve‑tone technique focuses on pitch, post‑war composers expanded the idea to "total" or "integral" serialism, applying series to rhythm, dynamics, articulation, timbre, and register. The results often emphasize clarity of event over tonal center, pointillistic textures, and rigorous formal control. Aesthetic outcomes range from Berg’s expressive lyricism to Webern’s ultra‑condensed, crystalline writing, and later to the highly systematized post‑war European avant‑garde. Serialism remains a cornerstone of 20th‑century modernist practice, whether embraced, extended, or reacted against by subsequent movements.
Muzika Mizrahit
Muzika mizrahit (Israeli Mizrahi or Oriental music) is a modern Israeli popular genre rooted in the musical traditions of Jewish communities from the Middle East, North Africa, and the Mediterranean. It blends Arabic, Turkish, Greek (laïko/rebetiko), and Andalusian influences with Hebrew lyrics and contemporary pop production. Musically it favors modal melodies drawn from Middle Eastern maqam systems (e.g., Hijaz, Bayat, Kurd) and characteristic vocal ornamentation (melisma, microtonal inflections). Typical instruments include oud, bouzouki, qanun, violin, darbuka/tabla, riq, and handclaps, increasingly complemented by synthesizers, drum machines, and pop/EDM-style arrangements. Lyrically, songs often revolve around love, longing, family, faith, and place, moving between dance-forward party anthems and deeply emotive ballads. Since the 1990s, the style has moved from a marginalized “cassette culture” to the mainstream of Israeli pop.
Tape Music
Tape music is a form of early electronic and electroacoustic composition that uses recorded sounds on magnetic tape as the primary material. Composers assemble, cut, splice, loop, reverse, and vary the speed of tape to sculpt timbre, rhythm, and form, often transforming everyday noises into abstract musical structures. Emerging from post–World War II studio experimentation, it blurred the line between composition and sound design. Works are typically fixed-media pieces intended for loudspeaker playback rather than traditional performance, privileging timbral exploration, spatial projection, and montage over conventional harmony and meter.
Electronic
Electronic is a broad umbrella genre defined by the primary use of electronically generated or electronically processed sound. It encompasses music made with synthesizers, drum machines, samplers, computers, and studio/tape techniques, as well as electroacoustic manipulation of recorded or synthetic sources. The genre ranges from academic and experimental traditions to popular and dance-oriented forms. While its sonic palette is rooted in electricity and circuitry, its aesthetics span minimal and textural explorations, structured song forms, and beat-driven club permutations. Electronic emphasizes sound design, timbre, and studio-as-instrument practices as much as melody and harmony.
Mechanical Music
Mechanical music is music generated by self‑playing instruments that read and reproduce music through purely mechanical means, with no major electronically controlled elements. Typical carriers include pinned cylinders and discs (music boxes and barrel organs), perforated paper rolls (player pianos), and cardboard music books (fairground and dance organs). Sound is produced by physical actions—plucked steel teeth, organ pipes driven by bellows, struck strings or percussion—set in motion by clockworks, cranks, weights, or pneumatic actions. The result is a precise, repeatable performance that reflects both the arrangement encoded on the medium and the tonal character of the instrument.
Balinese Traditional
Balinese traditional music refers to the ritual, courtly, and community-based musical arts of Bali, Indonesia, centered on diverse gamelan ensembles and vocal-ritual practices. It is distinguished by brilliant bronze sonorities, interlocking (kotekan) figurations, paired-tuned instruments that create a living “shimmer” (ombak), and a powerful colotomic gong cycle. Within this umbrella are ancient ceremonial ensembles (e.g., Selonding), refined court genres (Semar Pegulingan, Gong Gede), gender wayang for shadow theater, bamboo orchestras (Joged Bumbung, Jegog), dynamic modern idioms like Gong Kebyar, and trance-chant forms (e.g., Sanghyang and the later stage form Kecak). Music is inseparable from temple cycles, dance-drama, and communal life, with the drum leader (kendang) cueing phrasing, dynamics, and dance-musical accents (angsel).
Has influenced
Minimalism
Minimalism is a style of Western art music that emerged in the United States during the 1960s, characterized by the use of very limited musical materials, steady pulse, and extensive repetition. Composers often build pieces from short cells or motifs that are repeated and slowly transformed through additive or subtractive processes, phase shifting, and gradual changes in harmony, texture, or register. Harmony is typically consonant (often modal or diatonic), though just intonation and extended drones are also common. The result is music that foregrounds process, clarity, audibility of structure, and a hypnotic sense of stasis and flow. Typical ensembles include keyboards, mallet percussion, strings, winds, voices, and electronics or tape. Minimalism influenced a wide array of later styles, from ambient and new age to post-minimalism and minimal techno.
Ambient
Ambient is a form of electronic and electroacoustic music that prioritizes tone, atmosphere, and texture over conventional song structures and rhythmic drive. It typically features slow-moving harmonies, sustained drones, gentle timbral shifts, and extensive use of space and silence. Rather than drawing attention to itself through hooks or beats, ambient is designed to be as ignorable as it is interesting, rewarding both background listening and focused immersion. Artists often employ synthesizers, samplers, tape loops, field recordings, and subtle acoustic instruments, with reverb and delay creating a sense of place. Substyles range from luminous, consonant soundscapes to darker, more dissonant atmospheres.
Drone
Drone is a minimalist music genre defined by sustained tones, long durations, and extremely gradual change. Harmony is often static or centered on a single fundamental with subtle overtone shifts, while rhythm tends toward stasis or very slow pulses. Sound sources range from acoustic instruments (e.g., strings, organ, bagpipes, shruti box, tambura) to electronics (sine waves, oscillators, feedback, tape loops, and later digital synthesis and processing). Many composers favor just intonation or other alternative tuning systems to emphasize beating patterns, psychoacoustic effects, and the internal life of sound. Although drone as a sonic principle is ancient and global, the modern experimental genre cohered in the 1960s through the New York minimalists and related avant‑garde circles, then spread into ambient, experimental, and heavy music scenes. The focus is less on melody and more on timbre, resonance, and the phenomenology of listening.
Sound Art
Sound art is an interdisciplinary practice that treats sound itself as the primary artistic material, often prioritizing listening, space, and context over conventional musical form. It commonly appears as installations, sculptures, site‑specific works, and conceptual pieces presented in galleries, museums, and public spaces rather than on a traditional stage. Rather than focusing on melody, harmony, or beat, sound art emphasizes timbre, texture, perception, and spatialization. Works may use field recordings, environmental sound, feedback, room acoustics, silence, psychoacoustic phenomena, or generative and interactive systems. The listener’s movement, the architecture, and the social environment frequently become integral to the piece, encouraging attentive, situation‑based listening.
Totalism
Totalism is a postminimalist current in American contemporary composition that emerged in New York City at the turn of the 1990s. It pairs minimalism’s driving repetition and clear harmonies with the simultaneous layering of contrasting tempos, meters, and rhythmic cycles. Where classic minimalism often favors a single steady pulse, totalism embraces multiple, coexisting pulses—often in rational tempo ratios (such as 3:2, 4:3, 5:4)—to create grooves that are both propulsive and metrically intricate. Its sound world frequently mixes amplified chamber ensembles with rock instrumentation (drum set, electric guitar and bass) and draws rhythmic inspiration from rock, funk, and global polyrhythms. Aesthetically, totalism sought a middle path between the austerity of modernist complexity and the smooth surfaces of early minimalism: music that is visceral and loud, yet intellectually and rhythmically detailed.
Experimental Ambient
Experimental ambient is a textural, exploratory branch of ambient music that prioritizes sound design, space, and timbre over traditional melody, harmony, and rhythm. It often uses drones, field recordings, electroacoustic processing, and extended studio techniques to shape immersive sonic environments. Rather than following song forms, pieces evolve gradually, foregrounding subtle change, psychoacoustic detail, and the interplay between natural and synthetic sound sources. The result ranges from serene and contemplative to eerie and abstract, inviting deep listening and open-ended interpretation.
Minimal Techno
Minimal techno is a stripped-down, precision-focused branch of techno that emphasizes space, repetition, and subtle change over time. It typically uses a small palette of elements—kick, hi-hats, sparse percussion, a bass pulse, and a few tonal stabs or textures—and relies on micro-variations, dynamics, and timbral modulation to create movement. Rather than dense layering, minimal techno foregrounds negative space and groove, often highlighting the interplay between a hypnotic 4/4 kick and minimal percussive details. The result is a deep, immersive club sound where patience, restraint, and nuance are central to the aesthetic.
Algorave
Algorave is a form of dance music culture where the music is created and manipulated live through code, with the performer writing algorithms on stage that generate rhythm, melody, and timbre in real time. The audience typically sees the code projected, turning the act of programming into an expressive, improvisatory performance. Sonically, algorave draws on club styles like techno, house, acid, and rave, while embracing experimental tactics from glitch, IDM, and live algorithmic composition. Expect driving tempos (often 120–160 BPM), polyrhythms, euclidean patterns, evolving loops, and raw, percussive sound design that foregrounds process, pattern, and transformation.

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