OK, a tough one: Jim Pepper adapted this song from an ancient Native American peyote chant he learned from his grandfather. First recorded by his group Everything Is Everything. Only Billboard hit (#69 in '69) to feature a Native American chant. Brewer & Shipley's cover was sung phonetically and got respectable FM airplay.
Yesterday's answer: "Suzanne" by Leonard Cohen. The beautiful Suzanne Verdal was the muse. One of "da man's" most-covered songs - Fairport Convention, Harry Belafonte, Joan Baez, James Taylor and Peter Gabriel, among many others.