Listen to Piano Concerto No. 5 in E-Flat Major, Op. 73: II. Adagio un popco mosso online. Piano Concerto No. 5 in E-Flat Major, Op. 73: II. Adagio un popco mosso is an English language song and is sung by George Walker. Piano Concerto No. 5 in E-Flat Major, Op. 73: II. Adagio un popco mosso, from the album George Walker: Composer and Performer, was released in the year 2014. The duration of the song is 8:20. Download English songs online from JioSaavn.