Listen to I. Allegro online. I. Allegro is an English language song and is sung by Virtuosi Saxoniae and Ludwig Güttler. I. Allegro, from the album 25 Works by 25 Italian Composers - Verdi - Vivaldi - Puccini - Monteverdi - Rossini, was released in the year 2012. The duration of the song is 3:22. Download English songs online from JioSaavn.