Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1979 , he recorded the theme song for the hit television show The Dukes of Hazzard , and also served as the narrator ( `` The Balladeer '' ) for all seven seasons of the show .
Simplified: In 1979 , he recorded the theme song for the television show The Dukes of Hazzard . Jennings also became the narrator of the show for all seven seasons .