Beethoven: Piano Concerto No. 2 in B-Flat Major, Op. 19 - I. Allegro con brio (Cadenza by Duchâble) (贝多芬：降B大调第二钢琴协奏曲，Op. 19 - 第一乐章 有活力的快板（杜夏布勒华彩段）)