I've just been surfing around the urban legends reference pages (www.snopes.com), and found a fascinating piece about Iron Eyes Cody, looking at the question of whether he was actually a Native American.
I'd never heard of him until he cropped up on Lakota, singing that haunting intro; my enjoyment of that was tempered by the knowledge that Joni and her crew had recorded him singing the intro, then put it through the Fairlight so they could change the key to bring it into line with the song and chop it up to make it sound as if he was singing BVs throughout the track. Sacrilege, I thought! I had these worthy thoughts that some sacred chant of his had been desecrated. Well, I still think that a bit, but I know now that Ol' Iron Eyes wasn't quite all he seemed either... Azeem in London NP: Aimee Mann - Lost in Space