Acousmatic music

Acousmatic music (from Greek ἄκουσμα akousma, "a thing heard") is a form of electroacoustic music that is specifically composed for presentation using speakers, as opposed to a live performance. It stems from a compositional tradition that dates back to the origins of musique concrète in the late 1940s. Unlike acoustic or electroacoustic musical works that are realized from scores, compositions that are purely acousmatic (in listening terms) often exist solely as fixed media audio recordings. The compositional practice of acousmatic music features acousmatic sound, sound which is heard but not seen, as a central musical aspect.