Piano Sonata No. 13 in E-Flat Major, Op. 27 No. 1 - Beethoven: Piano Sonata No. 13 in E-Flat Major, Op. 27 No. 1: I. Andante - Allegro - Tempo I (降E大调第13号钢琴奏鸣曲，作品27之1 - 第一乐章：行板－快板－回原速)