Flute Sonata No. 9 in D Minor, HWV 367b - Sonatas for an Accompanied Solo Instrument, Op. 1, Sonata for flute in D Minor, Op. 1 No. 9, HWV 367b: I. Largo (D小调长笛奏鸣曲，作品1之9 - 第一乐章 广板)