 The theoretical basis of "musique concrète" as a compositional practice was developed by French composer Pierre Schaeffer beginning in the early 1940s, and originally contrasted with "pure" "elektronische Musik" (based solely on the use of electronically produced sounds rather than recorded sounds).Schaeffer's work resulted in the establishment of France's Groupe de Recherches de Musique Concrète (GRMC), which attracted important figures including Pierre Henry, Luc Ferrari, Pierre Boulez, Karlheinz Stockhausen, Edgar Varèse, and Iannis Xenakis.From the late 1960s onward, and particularly in France, the term acousmatic music ("musique acousmatique") started to be used in reference to fixed media compositions that utilized both musique concrète based techniques and live sound spatialisation.