1. Term created in the 60s to denote diffused electroacoustic music works in concert offering the listener a "sound spectacle".
2. Musical use of sound in a cinema-like manner; that is, that the perceived sound sources contribute to the appreciation of a work. (reduced from Dictionnaire des arts médiatiques: http://www.dictionnairegram.org)
See also:Acousmatic, Anecdotal Composition, Discourse within Electroacoustic Music, Narrative, Radiophonics