Listen to Grieg Piano Concert in a Minor, Op. 16: I. Allegro Molto Moderato online. Grieg Piano Concert in a Minor, Op. 16: I. Allegro Molto Moderato is an English language song and is sung by The Warner Bros. Orchestra and George Greeley. Grieg Piano Concert in a Minor, Op. 16: I. Allegro Molto Moderato, from the album Epic Dramatic Music, was released in the year 2015. The duration of the song is 5:37. Download English songs online from JioSaavn.