When Marty Stuart was 12 years old, he spotted Connie Smith and told his mother, ""I'm gonna marry her someday."" More than 25 years later, he did. Each had been married before, and Smith had five children, but when the road dog and the angelic voice sat down to write songs together, magic captured their hearts. In this exclusive interview, they share their very private relationship -- fueled by the heart, based on faith and tempered by a shared sense of humor. Filmed in the heart of the Tennessee hills (in an old log cabin), the episode includes an exclusive duet rendition of ""Farmer's Blues,"" which they wrote.