The Medford Public Library presents a teen-led book club, this month discussing "Symphony for the City of the Dead: Dmitri Shostakovich and the Siege of Leningrad," by M.T. Anderson. This is the true story of a city under siege in World Ward II, and the triumph of bravery and defiance in the face of terrifying odds. It is also a look at the power — and layered meaning — of music in beleaguered lives. You can download the ebook for…