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 Instrumental language song and is sung by Boris Berezovsky, Semyon Kogan and Rostov Philharmonic Symphony Orchestra. Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e molto maestoso, from the album IX International Tchaikovsky Competition, 1990. Winners (Live), was released in the year 1990. The duration of the song is 19:01. Download Instrumental songs online from JioSaavn.