Listen to Violin Concerto No. 1, Op. 6: I. Allegro maestoso online. Violin Concerto No. 1, Op. 6: I. Allegro maestoso is an Instrumental language song and is sung by Leonid Kogan, Vassili Nebolsin, Bolshoi Theatre Orchestra and Grand Symphony Orchestra of All-Union National Radio Service and Central Television Networks. Violin Concerto No. 1, Op. 6: I. Allegro maestoso, from the album Leonid Kogan. Collection, was released in the year 2018. The duration of the song is 22:49. Download Instrumental songs online from JioSaavn.