Listen to I. Allegro - 1 online. I. Allegro - 1 is an English language song and is sung by Württemberg Chamber Orchestra Heilbronn, Jörg Faerber, Martin Galling, Susanne Lautenbacher, Erich Penzel and Helmuth Irmscher. I. Allegro - 1, from the album 66 Bach Masterpieces, was released in the year 2011. The duration of the song is 4:43. Download English songs online from JioSaavn.