The term Process Music (in the minimalist sense) was coined by composer Steve Reich in his 1968 manifesto entitled "Music as a Gradual Process" in which he very carefully yet briefly described the entire concept including such definitions as phasing and the use of phrases in composing or creating this music, as well as his ideas as to its purpose and a brief history of his discovery of it.
Udtrykket procesmusik (i minimalistisk forstand) blev udmøntet af komponisten Steve Reich i hans manifest fra 1968 med titlen "Music as a Gradual Process" hvor han meget omhyggeligt, men dog kort, beskrev hele konceptet, herunder definitioner som phasing og brugen af musikalske fraser til at komponere eller at skabe denne musik, såvel som hans idéer med hensyn til dens formål, og en kort historie om sin opdagelse af det.