From the Civil War to the Dust Bowl and from baseball to jazz, Ken Burns documentaries have covered a range of critical events in American history and culture. Now, country music is getting the Ken Burns treatment. He and long-time collaborators and producers Dayton Duncan and Julie Dunfey spent eight years researching and making an eight-part, 16-hour documentary called Country Music , which will air in six parts beginning Sunday, Sept. 15 on GPB.