Listen to I. Overture - Adagio - Allegro - Lentement - Allegro online. I. Overture - Adagio - Allegro - Lentement - Allegro is an Unknown language song and is sung by The Vienna State Opera Orchestra. I. Overture - Adagio - Allegro - Lentement - Allegro, from the album Childrens Fantasies, was released in the year 2015. The duration of the song is 11:04. Download Unknown songs online from JioSaavn.