Listen to Violin Concerto No. 1 in B-Flat Major, K. 207: I. Allegro moderato online. Violin Concerto No. 1 in B-Flat Major, K. 207: I. Allegro moderato is an Instrumental language song and is sung by Boris Gutnikov and Leningrad Chamber Orchestra. Violin Concerto No. 1 in B-Flat Major, K. 207: I. Allegro moderato, from the album Mozart: Violin Concertos Nos. 1, 3, 4, was released in the year 1973. The duration of the song is 6:44. Download Instrumental songs online from JioSaavn.