Listen to Piano Trio in G Major, K. 564: III. Allegretto online. Piano Trio in G Major, K. 564: III. Allegretto is an Instrumental language song and is sung by Leonid Kogan, Mstislav Rostropovich and Emil Gilels. Piano Trio in G Major, K. 564: III. Allegretto, from the album Leonid Kogan. Collection, was released in the year 2018. The duration of the song is 5:17. Download Instrumental songs online from JioSaavn.