Listen to Impromptus, Op. 90: No. 3 in G-Flat Major. Andante online. Impromptus, Op. 90: No. 3 in G-Flat Major. Andante is an Unknown language song and is sung by Alfred Brendel. Impromptus, Op. 90: No. 3 in G-Flat Major. Andante, from the album Autobahn Classics, Vol. 10 (Classical Music Remastered for a Noisy Environment), was released in the year 2014. The duration of the song is 5:20. Download Unknown songs online from JioSaavn.