Listen to Piano Concerto No. 24 in C Minor, K. 491: I. Allegro online. Piano Concerto No. 24 in C Minor, K. 491: I. Allegro is an English language song and is sung by Denis Matthews. Piano Concerto No. 24 in C Minor, K. 491: I. Allegro, from the album Classical Music to Make You Smarter, was released in the year 2014. The duration of the song is 13:52. Download English songs online from JioSaavn.