Piano Sonata No. 21 in C Major, Op. 53 "Waldstein" - Beethoven: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio (C大调第21号钢琴奏鸣曲，作品53“华尔斯坦” - 第一乐章 有活力的快板)