Listen to Cello Concerto: II. Allegretto online. Cello Concerto: II. Allegretto is an Instrumental language song and is sung by Mstislav Rostropovich, Kirill Kondrashin, Moscow Philharmonic Symphony Orchestra and Moscow Philharmonic Symphony Orchestra. Cello Concerto: II. Allegretto, from the album Young Slava, was released in the year 2017. The duration of the song is 6:48. Download Instrumental songs online from JioSaavn.