Listen to Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e molto maestoso online. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e molto maestoso is an English language song and is sung by London Festival Orchestra, Alberto Lizzio and Dieter Goldman. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e molto maestoso, from the album The Greatest Classical Collection Ever: 222 All Time Favorite Classics, was released in the year 2013. The duration of the song is 8:50. Download English songs online from JioSaavn.