Few performers in country music have proved as influential and iconic as Loretta Lynn. At a time when women usually took a back seat to men in Nashville, Lynn was a voice of strength, independence, and sometimes defiance, writing and singing songs that spoke to the concerns of working-class women with unapologetic honesty. She could sing of her hardscrabble childhood ("Coal Miner's Daughter"), deal with the realities of relationships ("Fist City," "You Ain't Woman Enough"), deliver proto-feminist anthems ("The Pill"), and explore mature romance (her series of duets with Conway...