Listen to Concerto No. 18 in B-Flat Major for Piano and Orchestra, K. 456: I. Allegro vivace online. Concerto No. 18 in B-Flat Major for Piano and Orchestra, K. 456: I. Allegro vivace is an English language song and is sung by Carmen Piazzini. Concerto No. 18 in B-Flat Major for Piano and Orchestra, K. 456: I. Allegro vivace, from the album Mozart: The Piano Concertos, was released in the year 2010. The duration of the song is 11:57. Download English songs online from JioSaavn.