Listen to Music for String Quartet: III. Allegro Moderato online. Music for String Quartet: III. Allegro Moderato is an English language song and is sung by Alexey Shelygin and Russian State Symphony Orchestra Cinematography Ensemble of Soloists. Music for String Quartet: III. Allegro Moderato, from the album Orchestral and Chamber Works, was released in the year 2016. The duration of the song is 3:12. Download English songs online from JioSaavn.