Spatialization of music / Spatial music

The term concerns music composed with consious use of  location and movement of sound sources. Charles Ives' The Unanswered Question (1908) may serve as one of the first 20th-century examples of the phenomena, in which the strings are placed offstage in opposition to the on-stage trumpet and woodwind ensemble. 20th-century composers used spatial distribution of musicians or loudspeakers also to facilitate the audience’s perception of complicated, multi-layered musical textures.