LeAnn Rimes made an audacious debut at the age of 13 by taking "Blue," a honky tonk ballad closing in on its 30th birthday, to Billboard's Country Top Ten in 1996. "Blue" conjured the ghost of Patsy Cline, a comparison Rimes quickly shook off by concentrating on contemporary pop material. Many of her early smashes were power ballads that performed better on the pop charts than country: the Diane Warren-written "How Do I Live" went to number two in 1997, while "Looking Through Your Eyes" made it to 18 the following year. "Can't Fight the Moonlight," the theme song from the 2000...