Most previous books about Dmitri Shostakovich have focused on either his symphonies and operas, or his relationship to the regime under which he lived, or both, since these large-scale works were the ones that attracted the interest and sometimes the condemnation of the Soviet authorities. Music for Silenced Voices looks at Shostakovich through the back door, as it were, of his fifteen quartets, the works which his widow characterized as a "diary, the story of his soul." The silences and the voices were of many kinds, including the political silencing of adventurous writers,...