It's difficult to find a country performer who has moved from her country roots to international fame more successfully than Dolly Parton. Her autobiographical single "Coat of Many Colors" shows the poverty of growing up one of 12 children on a rundown farm in Locust Ridge, Tennessee. At 12 years old, she was appearing on Knoxville television; at 13 she was recording on a small label and appearing on the Grand Ole Opry. Her 1967 hit "Dumb Blonde" (which she's not) caught Porter Wagoner's ear, and he hired Parton to appear on his television show, where their duet numbers became...