Listen to I. Allegro online. I. Allegro is an English language song and is sung by Kurt Sanderling, Dieter Zechlin and Gewandhausorchester Leipzig. I. Allegro, from the album Van Beethoven: Piano Concerto No. 5 / Piano Sonata No. 26, was released in the year 2009. The duration of the song is 20:26. Download English songs online from JioSaavn.