Listen to Viola Sonata in F Minor, Op. 49: I. Moderato online. Viola Sonata in F Minor, Op. 49: I. Moderato is an Instrumental language song and is sung by Fyodor Druzhinin and Larisa Panteleeva. Viola Sonata in F Minor, Op. 49: I. Moderato, from the album Glinka, Rubinstein & Shostakovich: Viola Sonatas, was released in the year 2004. The duration of the song is 9:13. Download Instrumental songs online from JioSaavn.