Garth is a narrator...
Dolly and Willie are acting together...

Garth Brooks serves as narrator and executive producer of the new documentary series America's National Parks on Nat Geo. 
The series will span five episodes covering the Grand Canyon, Yosemite, Big Bend, Badlands and Hawai'i Volcanoes National Park. 
America's National Parks will air from August 29th to September 2nd, with new episodes nightly.

Dolly Parton and Willie Nelson were spotted together at Dollywood earlier this week. Word is they were filming scenes for Dolly's holiday movie, Dolly Parton's Mountain Magic Christmas.
The movie is about a television special being filmed at Dollywood in which Dolly learns a valuable lesson from three wise men. 
Jimmy Fallon, Billy Ray and Miley Cyrus are also in the film.