Listen to Clarinet Sonata in A-Flat Major, Op. 49 No. 1: I. Allegro affannato online. Clarinet Sonata in A-Flat Major, Op. 49 No. 1: I. Allegro affannato is an English language song and is sung by Stephan Siegenthaler. Clarinet Sonata in A-Flat Major, Op. 49 No. 1: I. Allegro affannato, from the album Reger: Integrale Kammermusik für Klarinette, was released in the year 2016. The duration of the song is 7:13. Download English songs online from JioSaavn.