Listen to Allegro in B-Flat Major, K. 400 online. Allegro in B-Flat Major, K. 400 is an English language song and is sung by Giovanni Umberto Battel. Allegro in B-Flat Major, K. 400, from the album Mozart: Piano Solo, was released in the year 2017. The duration of the song is 5:04. Download English songs online from JioSaavn.