Piano Sonata No. 19 in G Minor, Op. 49 No. 1 - Piano Sonata No. 19 in G minor, Op 49 No.1: I. Allegro Ma Non Troppo (G小调第十九号钢琴奏鸣曲，Op. 49 No. 1 - 第一乐章 不过分的快板)