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: II. Organo ad libitum: Adagio - Fuga (降B大调第9号管风琴协奏曲，作品308 - 第二乐章 管风琴自由演奏：柔板 - 赋格)