Organ Concerto No. 9 in B Flat Major, Op. 7, No. 3, HWV 308 - Handel: Organ Concerto No. 9 in B Flat Major, Op. 7, No. 3, HWV 308: I. Allegro (降B大调第9号管风琴协奏曲，作品308 - 第一乐章 快板)