Amazing Grace - Arlo Guthrie.
Correct! There is another song from Woodstock written in 1909. Sung by Joan Baez. And still another song played by Jimi Hendrix written about 1814. The point being that some music does last for 50 years and longer. The idea that music from the 1960s is used up and gone forever is simply foolish thinking.
Yes, Englishman John Newton wrote the lyrics then, but the music we associate with "AG" today came from a folk hymnal published in the U.S. during the 1820s.