Four hands Harpsichord Sonata in C Major, KV 19d - Four Hands Harpsichord Sonata in C Major, KV. 19d: I. Allegro (C大调四手联弹羽管键琴奏鸣曲，KV 19d - 四手联弹羽管键琴奏鸣曲，KV. 19d：第一乐章 快板)