Dozens of individuals were interviewed to make the film, including family members, associates and musicians who both worked with Parsons and have been influenced by him. These are some of the people who feature in the programme...
Family
Diane Parsons is Gram's half-sister.
Gretchen Parsons Carpenter was Gram's wife.
Polly Parsons is Gram Parsons' daughter.
Musicians
Peter Buck is the guitarist in REM.
Jon Corneal was the drummer with The International Submarine Band and Flying Burrito Brothers.
Steve Earle is an acclaimed singer-songwriter. His albums include Guitar Town and El Corazon.
Emmylou Harris first came to prominence on Gram Parsons' two solo albums GP and Grievous Angel.
Chris Hillman was a founding member of the Byrds and co-founded The Flying Burrito Brothers with Gram Parsons.
Sneaky Pete Kleinow played pedal steel in The Flying Burrito Brothers. He later recorded with Frank Zappa, Stevie Wonder and John Lennon.
Bernie Leadon was in The Flying Burrito Brothers before becoming one of the founding members of The Eagles.
John Nuese was the guitarist in the International Submarine Band with Gram Parsons.
Keith Richards and Gram Parsons were close friends. Parsons stayed with Richards during the recording of the Rolling Stones' Exile on Main Street.
Dwight Yoakam is a singer-songwriter credited with returning country music to its traditional roots.
Friends and associates
Pamela des Barres is the author of the classic groupie memoir, I'm With the Band, and describes herself as the Burritos' "biggest fan".
Jim Carlton was a teenage friend of Gram and performed with him in their teenage band The Legends.
Barry Feinstein is a photographer and shot the covers for Gilded Palace of Sin by The Flying Burrito Brothers and Gram Parsons' two solo albums.
Margaret Fisher was a childhood friend of Gram and was with him when he died.
Phil Kaufman was Gram Parsons' road manager. To fulfill a pact with Gram, Kaufman stole Parsons' body after his death and burnt it in the California desert.
Dominique Tarlé photographed the Rolling Stones making Exile at Main Street at Keith Richards' French mansion Villa Nellcôte.
James E Thomas was Gram's teacher at Harvard University.