Various talking heads appear-including Dolly Parton, Willie Nelson, and Kacey Musgraves-to not only hype up her musical bonafides, but to credit her as a working mother on the road and overlooked icon in general.
In addition to never-before-seen archival footage, the documentary also includes additional interviews with Larry Gatlin, Robert Duvall, and Ronnie Dunn, as well as Reese Witherspoon, who famously played Carter Cash in the 2005 movie Walk the Line.
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