Listen to Sinfonia Concertante, E-Major, KV 364: I. Allegro Maestoso online. Sinfonia Concertante, E-Major, KV 364: I. Allegro Maestoso is an English language song and is sung by Pablo Casals, William Primrose, Isaac Stern and Perpignan Festival Orchestra. Sinfonia Concertante, E-Major, KV 364: I. Allegro Maestoso, from the album Classical Digitally Remastered: Wolfgang Amadeus Mozart, was released in the year 2012. The duration of the song is 13:21. Download English songs online from JioSaavn.