Listen to Guitar Concerto in D Major: I. Allegro online. Guitar Concerto in D Major: I. Allegro is an English language song and is sung by Konrad Ragossnig. Guitar Concerto in D Major: I. Allegro, from the album 100 Vivaldi Playlist, was released in the year 2014. The duration of the song is 3:34. Download English songs online from JioSaavn.