Listen to Concerto pour piano No. 1 in B-Flat Major, Op. 23: I. Allegro non troppo e molto maestoso online. Concerto pour piano No. 1 in B-Flat Major, Op. 23: I. Allegro non troppo e molto maestoso is an English language song and is sung by Vladimir Horowitz, Georges Szell and New York Philharmonic. Concerto pour piano No. 1 in B-Flat Major, Op. 23: I. Allegro non troppo e molto maestoso, from the album Tchaikovsky: Concerto pour piano No. 1, was released in the year 2015. The duration of the song is 18:19. Download English songs online from JioSaavn.