Listen to Piano Concerto No. 1 in B-flat minor, op 23: Allegro non troppo and very impressive (Excerpt) online. Piano Concerto No. 1 in B-flat minor, op 23: Allegro non troppo and very impressive (Excerpt) is an English language song and is sung by The Fine Classical Orchesta. Piano Concerto No. 1 in B-flat minor, op 23: Allegro non troppo and very impressive (Excerpt), from the album 51 Masterpieces of Classic, was released in the year 2011. The duration of the song is 3:24. Download English songs online from JioSaavn.