I don't know Tbird, will have to get back to you. Ya know, no offense intended, butI have studied a lot and attended many powwows and sundances over the years, all of them authentic. Some of my best friends are in drum groups and are dancers. And, I don't think any of them would care one bit if it was authentic or not; the sentiment and sincerity of it is what matters most to them. In a sweat with an elder from S. Dakota I had the honour of being told my heart was "red" and that was good enough for them and me.
And, I just remembered I have a wonderful book which has "authentic" songs in it, as they were transcribed in the 1800's, The Indian's Book: Authentic Native American Legends, Lore, & Music recorded and edited by Natalie Curtis (1875-1921).
Susan-Marie, I could scan in a few of the songs & email them to you as files, if you'd like. Just let me know.