Though other performers sold more records and earned greater fame, few had as profound an impact on contemporary music as Emmylou Harris. Blessed with a crystalline voice, a remarkable gift for phrasing, and a restless creative spirit, she traveled a singular artistic path, proudly carrying the torch of "cosmic American music" passed down by her mentor, Gram Parsons. With the exception of only Neil Young -- not surprisingly an occasional collaborator -- no other mainstream star established a similarly large body of work as consistently iconoclastic, eclectic, or daring; even m...