Capriccio in B-Flat Major, BWV. 992 "On the departure of a dear brother" - J.S. Bach: 1. Arioso (Capriccio in B flat) (降B大调随想曲，作品992“在一个亲爱的兄弟里出发” - 第一乐章 咏叹调 - 慢板)