Listen to Violin Concerto No. 7, KV 271a: I. Allegro Maestoso online. Violin Concerto No. 7, KV 271a: I. Allegro Maestoso is an English language song and is sung by Arthur Grumiaux and Wiener Symfoniker. Violin Concerto No. 7, KV 271a: I. Allegro Maestoso, from the album Absolutely Classical, Volume 89, was released in the year 2009. The duration of the song is 10:09. Download English songs online from JioSaavn.