Listen to Concert for Piano in B-Flat Minor, Op. 23: I. Allegro non troppo online. Concert for Piano in B-Flat Minor, Op. 23: I. Allegro non troppo is an English language song and is sung by Alexander Uninsky. Concert for Piano in B-Flat Minor, Op. 23: I. Allegro non troppo, from the album Tchaikovsky: Concert for Piano in B-Flat Minor, Op. 23, was released in the year 2015. The duration of the song is 18:36. Download English songs online from JioSaavn.