Flashback: Carrie Underwood, Jennifer Nettles Cover Dolly's '9 to 5'

In early 1981, thanks in part to the film Urban Cowboy, Billboard’s pop singles chart was routinely peppered with huge country crossover hits. In December 1980, another film with a country element to it turned one of its stars, singer-songwriter Dolly Parton, into Hollywood royalty and sent the self-penned theme…