Par CHOSTAKOVITCH DIMITRI. Shostakovich's last work, the Sonata For Viola And Piano Op. 147, is a superbly crafted Sonata in three movements with, unusually, a slow Adagio movement for the third. It was dedicated to the violist Fyodor Druzhinin, a professor of the Moscow Tchaikovsky Conservatory and a member of the Beethoven String Quartet, a renowned Moscow ensemble that played at the premieres o…