Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout) - IV. Theme and Variations (A大调钢琴五重奏，Op. 114, D. 667《鳟鱼》 - 第四乐章 主题与变奏)