Harrington's documentary The Winding Stream: The Carters, the Cashes and the Course of Country Music tells the story of country music's influential Carter family, and includes one of Johnny Cash's last interviews. The Winding Stream premiered at 2014's SXSW Film Festival, and went on to appear at over 30 other festivals. It was released in theaters across North America, and later had its digital and DVD launch on Netflix, Amazon, iTunes, Vudu and other platforms, and was well-reviewed in a number of national publications, including Variety, Rolling Stone, and The Hollywood Reporter. Harrington was also co-producer of The Winding Stream's soundtrack album, released by Omnivore Recordings. In 2021, the New York Daily News named The Winding Stream No. 56 on a list of the 100 best documentaries of all time.
