声音 being classified can be of 使用 both to the makers and listeners of 电子声学 音乐 Such 试图 of which there have been too few until this point were 创作 to assist in 作曲 approaches as well as the analytical experience/reception Examples include 舍费尔 理论 Wolfgang Thies' 类型学 der Klänge which used adjectival 声音 descriptors W Thies-Grundlagen einer 类型学 der Klänge Hamburg Verlag der Musikalienhandlung Karl Dieter Wagner 1982 and more 正式（形式） typologies 基于 on 物理 声音 特征 or 种类 of 声音 对象