Established in the 1950s by musician and engineer Pierre Schaeffer, the Groupe de Recherches Musicales would become the nerve center for avant-garde artists experimenting with sound and acoustics, as well as the birthplace of a genre of music-making enabled by new recording technologies and sound pioneers: musique concrète. Évelyne Gayou—herself a researcher, composer, and producer at the GRM—tells the history of the storied institution through the people, works, technologies, and research devel…