Listen to Cello Concerto: IV. Moderato non troppo - Allegretto online. Cello Concerto: IV. Moderato non troppo - 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: IV. Moderato non troppo - Allegretto, from the album Young Slava, was released in the year 2017. The duration of the song is 6:52. Download Instrumental songs online from JioSaavn.