The 术语 采用 by the 作曲家 Edgard 瓦雷兹 to 描述 his 樂/乐 His 用 of this 术语 reflects in 特殊 his insistence on the 樂/乐 潜力 of a widening 'palette' of 可能 声 for 用 in the concert hall in 特殊 打击乐 resources electronically-generated 声波 and 录制 声波 The 术语 is often cited in 试图 to 定义 樂/乐 and anticipates the 概念 of 樂/乐 as a 'plastic' 艺术 形(曲)式