Listen to Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo online. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo is an English language song and is sung by London Symphony Orchestra, Byron Janis and Herbert Menges. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo, from the album Classical Meditation & Relaxation, was released in the year 2014. The duration of the song is 18:53. Download English songs online from JioSaavn.