As controversial as it is powerful, Dmitri Shostakovich's Fifth Symphony was written in the wake of the searing criticism of his opera, "Lady MacBeth of Mtensk."  This criticism had reduced Shostakovich from the golden boy of Soviet music to a near-un-person, in danger of disappearing to the gulags.  In response, Shostakovich withdrew his Fourth Symphony, an avant-garde work which would have cert…