In theaters in the United States and Canada now, “Rumble” explores the history of Native Americans in popular music, some celebrated for their work, others less so. Jesse Ed Davis, who played alongside the Rolling Stones and, over time, every one of the Beatles, is here, as is Buffy Sainte-Marie, the protest singer who composed songs about everything from young love and spirituality to cultural genocide and the theft of Indian lands. Jimi Hendrix, whose paternal grandmother was one-quarter Cherokee, appears, resplendent in a white beaded jacket and moccasins, at Woodstock, as does the jazz singer Mildred Bailey, whom a young Bing Crosby credited with giving him his start.
And then there’s Wray, whose song and sound went on to inspire musicians from Pete Townshend and Neil Young to Iggy Pop and MC5. “It wasn’t till later on that I found out that Link Wray was an Indian,” of Shawnee heritage, said Mr. Robertson, who learned to play guitar on the Six Nations reserve in Ontario. “It just made the whole thing 10 times cooler to me.”
One of the most striking aspects of the documentary is how few people, like Mr. Robertson, knew that these artists were Indians at all. Stevie Salas, an executive producer of the film who got his start playing electric guitar behind Rod Stewart and Bootsy Collins, recalled watching scenes of Mr. Davis playing in the 1972 documentary about George Harrison’s Concert for Bangladesh. “I’ve watched that footage a million times,” said Mr. Salas, who is Apache, “and all of a sudden I was like, how did I not notice the big, 6-foot Indian standing next to Eric Clapton?”
For every Redbone, the ’70s rockers who openly embraced their Indian roots, there were dozens of others who did not. For many, there was little upside to it. “Around the time when ‘Rumble’ came out, there was the Hayes Pond incident, where this Grand Dragon was preaching from the backs of trucks about the ‘mongrelization’ of white people by American Indians,” Ms. Bainbridge said, referring to a North Carolina confrontation between the Klan and the Lumbee. “Link Wray grew up in the center of all that, as did Native Americans throughout the South.”