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Based on the critically acclaimed book by Nicholas Lemann, thisfive-part documentary series-- airing Sunday, Monday through Wednesday and Saturday on the Discovery Channel (check local listings) -- is about the 1950s black migration from the oppressive conditions of the Mississippi Delta to the then-booming city of Chicago.TIME critic Richard Zoglinsays the understated narration by Morgan Freeman, evocative music and plainspoken words of people who lived through it, make it a must-see. Its "unhurried gravity is something close to poetry," Zoglin says.