Johnny Cash, "As Long as the Grass Shall Grow"
In the song's lines "The treaties are safe we'll keep our word but what is that gurgling/ It's the back water from Perfidy Lake it's rising all the time" Cash is referencing words from Melvin Patterson spoken on September 15, 1962 at the gathering and honoring of Chief Cornplanter and the Cornplanter Grant, land that would be completely inundated by the Allegany Reservoir.
During Patterson's speech he said "From this day forward we of Indian blood will call the waters that will flood this reservation practically out of existence the Lake of Perfidy." Lake of Perfidy is a reference to the lake that the reservoir would make out of the Senecas unceded land.
In 2015, Antonino D'Ambrosio directed and wrote the documentary We're Still Here: Johnny Cash's Bitter Tears Revisited that provides more in-depth information on Johnny Cash's album Bitter Tears: Ballads of the American Indian (1964).