Listen to No. 6, Festive Music. Allegro online. No. 6, Festive Music. Allegro is an English language song and is sung by Berlin Chamber Orchestra and Helmut Koch. No. 6, Festive Music. Allegro, from the album Leopold & Wolfgang Amadeus Mozart: Toy Symphony, Peasant Wedding, Musical Sleigh-Ride & A Musical Joke, was released in the year 2009. The duration of the song is 1:16. Download English songs online from JioSaavn.