33 Piano Variations In C, Op. 120 On A Waltz By Anton Diabelli - Variation 21. Allegro con brio – Meno allegro (以安东·迪亚贝利的圆舞曲为主题的C大调33首主题变奏曲，Op. 120 - 变奏曲21 有活力的快板-即比快板稍慢一些-速度1) (C major)