4. Carrie Underwood, ''I Can't Make You Love Me'' (season 4)
She was the fresh-faced farm girl who spent her days feeding cows and had never been on a plane. But when Carrie got in front of the judges and belted out Bonnie Raitt's most heartbreaking number, you didn't need a crystal ball to predict her multiplatinum future. Sure, Randy suggested that Carrie ''work a little bit more on the emotion and the stage presence,'' but even without stylists and vocal coaches and big-stage experience in her corner, the young lady from Oklahoma already had the competition in her denim pocket.

Carrie Underwood's audition: Watch it on YouTube