Former President Jimmy Carter, right, and his wife Rosalynn join country singer Willie Nelson on the stage during a free concert in Carter's hometown of Plains, Ga., on Thursday, Sept. 9, 2004. The concert culminated the filming of a Country Music Television Special titled, ``CMT Homecoming: Jimmy Carter in Plains.'' (AP Photo/Todd Stone)

Willie Nelson, Garth Brooks to Appear in New Documentary: 'Jimmy Carter: Rock & Roll President'

Willie Nelson, Garth Brooks, Trisha Yearwood and more will appear in a new documentary on President Jimmy Carter and his support for music and artists. Jimmy Carter: Rock & Roll President will be available in theatres on Sept. 9 and released for home entertainment in October.

The documentary, directed by Mary Wharton, focuses on Carter's love of music and the ways in which folk, gospel, jazz, rock and country music influenced his politics, from quoting Bob Dylan in speeches to his longtime friendship with Willie Nelson, the Allman Brothers and more.

"His love of music makes all kinds of sense to me because music is the voice of the heart," Garth Brooks says in the film. "Music is the voice of the soul. When you talk about heart and soul, I think he's the president of my mind — of my living time — that I can think of that brought it to the office."

Read More:  Willie Nelson Once Sang 'Amazing Grace' With Jimmy and Rosalynn Carter

In a clip from the documentary, Carter explains how music brings people together.

"I think music is the best proof that people have one thing in common — no matter where they live, no matter what language they speak."

Willie Nelson famously visited the White House during President Carter's term. In a 2015 interview with GQ, the country legend said that he smoked weed on the roof of the White House with an "insider," long rumored to be former President Carter's middle son Chip, now known as James Earl Carter III, though James Earl Carter III has never confirmed the story.

In a Los Angeles Times feature on the documentary, President Carter says that Nelson's infamous "big fat Austin torpedo" was indeed smoked by one of Carter's three sons.

The 95-year-old former president is still serving the country in a variety of ways. Just last year, Carter made headlines for his tireless work for Habitat for Humanity. Even after a fall at his home in October 2019 that required 14 stitches, Carter showed up to build a Nashville home.

For several years, Brooks and Trisha Yearwood have worked alongside Jimmy Carter and his wife Rosalynn, building homes for Habitat for Humanity.

"What the Carters stand for is what we should all shoot for as human beings. Please forget 'Republican' or 'Democrat.' What they are standing for is as human beings," Brooks told Yahoo last year. "If we're going to get anywhere as a human race, this is the path we want to follow. So anything keeping any kind of light on that path and those two people's dreams, then count us in."

Now Watch: Jimmy and Rosalynn Carter Are Now the Longest Married Presidential Couple