Listen to I. Allegro - 4 online. I. Allegro - 4 is an English language song and is sung by Württemberg Chamber Orchestra Heilbronn, Jörg Faerber, Hartmut Strebel, Gerhard Braun, Susanne Lautenbacher and Martin Galling. I. Allegro - 4, from the album 66 Bach Masterpieces, was released in the year 2011. The duration of the song is 7:21. Download English songs online from JioSaavn.