Listen to Symphony No. 33 in B-Flat Major, K. 319: I. Allegro assai online. Symphony No. 33 in B-Flat Major, K. 319: I. Allegro assai is an Instrumental language song and is sung by Yevgeny Mravinsky and Leningrad Philharmonic Symphony Orchestra. Symphony No. 33 in B-Flat Major, K. 319: I. Allegro assai, from the album Yevgeny Mravinsky. Selected Works, was released in the year 2003. The duration of the song is 7:17. Download Instrumental songs online from JioSaavn.