声 being classified can be of 用 both to the makers and listeners of 電聲學/电声学 樂/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 形式 typologies 底/基于 on 物理 声波 特征 or 种类 of 声波 对象