Switzerland’s Amati Quartet has recorded two highly contrasting works by Dmitri Shostakovich: with Bruno Canino, the Piano Quintet of 1940, which still maintains a recognizable tonal structure; and the Twelfth String Quartet, composed in 1968, a prime example of how Shostakovich approached the twelve-tone system in the string quartet. A grand, emotionally complex fabric in the piano quintet, and a reserved, reduced tonal idiom in the string quartet.