Listen to I. Allegro - 6 online. I. Allegro - 6 is an English language song and is sung by Kammerorchester Mainz, Günter Kehr and Susanne Lautenbacher. I. Allegro - 6, from the album 66 Bach Masterpieces, was released in the year 2011. The duration of the song is 9:00. Download English songs online from JioSaavn.