Listen to Sinfonia Concertante in E-Flat Major, KV 364: I. Allegro maestoso online. Sinfonia Concertante in E-Flat Major, KV 364: I. Allegro maestoso is an English language song and is sung by Rca Victor Symphony Orchestra, Izler Solomon, William Primrose and Jascha Heifetz. Sinfonia Concertante in E-Flat Major, KV 364: I. Allegro maestoso, from the album Mozart: Platinum Edition (The Greatest Works Ever!), was released in the year 2017. The duration of the song is 12:18. Download English songs online from JioSaavn.