Trio for Clarinet, Viola and Piano in E flat K.498 "Kegelstatt" - Mozart: Trio for Clarinet, Viola and Piano in E flat K.498 "Kegelstatt": 1. Andante (为单簧管，中提琴和钢琴而作的降E大调三重奏，作品498 - 第一乐章 行板)