Listen to Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e maestoso online. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e maestoso is an English language song and is sung by Saint Petersburg Academic Symphony Orchestra. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e maestoso, from the album Classical Music for Thanksgiving Dinner, was released in the year 2015. The duration of the song is 20:34. Download English songs online from JioSaavn.