Pierre Schaeffer helped form Studio d'Essai de la Radiodiffusion-Télévision Française in France during World War II. Initially serving the French Resistance, Studio d'Essai became a hub for musical development centered around implementing electronic devices in compositions. It was from this group that musique concrète was developed. A type of electroacoustic music, musique concrète is characterized by its use of recorded sound, electronics, tape, animate and inanimate sound sources, and various manipulation techniques. The pieces heard on this album were composed by members of Groupe de Recherches de Musicales. I've included scans of the insert containing notes for each piece. Listen.