Sound coming from outside the field of vision, from somewhere beyond, holds a privileged place in the Western imagination. When separated from their source, sounds seem to manifest transcendent realms, divine powers, or supernatural forces. According to legend, the philosopher Pythagoras lectured to his disciples from behind a veil, and two thousand years later, in the age of absolute music, listeners were similarly fascinated with disembodied sounds, employing various techniques to isolate sounds from their sources. With recording and radio came spatial and temporal separation of sounds from sources, and new ways of composing music. Sound Unseen: Acousmatic Sound in Theory and Practice explores the phenomenon of acousmatic sound. An unusual and neglected word, "acousmatic" was first introduced into modern parlance in the mid-1960s by avant garde composer of musique concr
