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GRM (Groupe de Recherches Musicales) emerged at French radio as a rebellion against abstract scores. In 1948, Pierre Schaeffer used the "locked groove" of a vinyl record to loop train whistles. This sparked "reduced listening"—perceiving the mass and texture of a sound divorced from its physical source. To manipulate this new matter, engineers built Phonogènes, which shifted pitch via tape speed, and Morphophones for complex delays.

The studio's aesthetic demanded a radical break from the past. The flagship matrix synthesizer built by Francis Coupigny in 1969 fundamentally lacked a keyboard; Schaeffer believed keys forced composers back into 19th-century harmony. Sound was sculpted purely by ear. However, Schaeffer's dictatorship—which banned mathematical probabilities—sparked internal schisms, leading Iannis Xenakis to leave the studio in protest.

In the 70s, GRM entered an ideological war with Pierre Boulez's IRCAM, a heavily funded temple of mainframes and cold digital calculation. Schaeffer criticized early computers for lacking real-time audio feedback. Yet GRM adapted to digital on its own terms: in 1984, engineer Jean-François Allouis launched the SYTER system, featuring real-time mouse control. In the 90s, its algorithms formed the basis of the GRM Tools plugins, making Parisian laboratory sound design accessible worldwide.