Listen to Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro online. Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro is an English language song and is sung by Philharmonia Orchestra. Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro, from the album Classical Music to Make You Smarter, was released in the year 2014. The duration of the song is 6:37. Download English songs online from JioSaavn.