Listen to Piano Concerto No.1, Op. 23: I. Allegro non troppo e molto maestoso - Allegro con spirito online. Piano Concerto No.1, Op. 23: I. Allegro non troppo e molto maestoso - Allegro con spirito is an English language song and is sung by André Watts, Leonard Bernstein and New York Philharmonic Orchestra. Piano Concerto No.1, Op. 23: I. Allegro non troppo e molto maestoso - Allegro con spirito, from the album André Watts The Complete Columbia Album Collection, was released in the year 2016. The duration of the song is 22:29. Download English songs online from JioSaavn.