String Quartet No. 10 in E Flat Major, Op. 74 "Harp" - Beethoven: String Quartet No. 10 in E Flat Major, Op. 74 "Harp" - I. Poco adagio - Allegro (降E大调第10号弦乐四重奏，作品74“竖琴” - 第一乐章 稍柔板，快板)