Listen to Sonata for Viola and Piano, Op. 147: II. Allegretto online. Sonata for Viola and Piano, Op. 147: II. Allegretto is an Instrumental language song and is sung by Sviatoslav Richter and Yuri Bashmet. Sonata for Viola and Piano, Op. 147: II. Allegretto, from the album Sviatoslav Richter 100, Volume 44 (Live), was released in the year 2015. The duration of the song is 6:19. Download Instrumental songs online from JioSaavn.