原文: Chopinesque Etude No. 1 in D Minor. , he only used 15 different keys. Samuel Wellman. Piano Method sheet music. Advanced.
译文: " I listed the 9 unused ones and decided to write an etude in each of those keys, while imitating. 塞缪尔·威尔曼. 钢琴方法乐谱. 钢琴独奏乐谱. 先进. 先进.