Musique concrète
The Acousmonium is the sound diffusion system designed in 1974 by Francois Bayle and used originally by the Groupe de Recherches Musicales at the Maison de Radio France. It consists of 80 loudspeakers of differing size and shape, and was designed for tape playback. As Bayle wrote in a CD sleeve note in 1993, it was The process of distributing compositions of electroacoustic music or Musique concrète across an acousmonium is called "diffusion". This is done by the composer or a performer by controlling and adjusting the spatial distribution and volume of the music during playback.