Listen to Concerto in B-Flat Major for Strings & Continuo, Op. 10 No. 1: I. Allegro online. Concerto in B-Flat Major for Strings & Continuo, Op. 10 No. 1: I. Allegro is an English language song and is sung by Heinrich Klug and Jörg Ewald Dähler. Concerto in B-Flat Major for Strings & Continuo, Op. 10 No. 1: I. Allegro, from the album Vivaldi & Albinoni: Concerti, was released in the year 1976. The duration of the song is 3:08. Download English songs online from JioSaavn.