This 术语 is 联合 with 各种各样 形式 of 樂/乐 that have focused on 噪 as its key 声波 品质 In the early 20th century 噪 was a focus of some 作品 by the 未来主义者 and Dadaists More recently it became a key ingredient of the 樂/乐 of many 朋克 音乐家 Today 用 the 术语 噪 樂/乐 as a 类别 描述 their 作品 Many of these 艺术家 are 联合 with 电子 and 用 噪 as their 主要 源 材料 音符 不 all 噪 樂/乐 has to be 响 Organised 声波 This is the 术语 采用 by the 作曲家 Edgard 瓦雷兹 [in the 1920s] 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 an expanding ‘palette’ of 可能 声 for 用 in the concert hall in 特殊 new kinds of 打击乐 电子 生成 声 and 录制 声 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 [Landy 2007a 10]