Forgive me if I am repeating, I have not read every single note in this thread. I was reading this thread on slavery while listening to the Celtic Radio, and it occurred to me that very few people realize that many Black spiritual songs are based on Irish and Scottish tunes.
Slaves were forbidden to sing the songs of their homeland, so they often used the music of their owners and put different words to them. American bluegrass country music can trace its roots to Irish and Scottish ancestry. it was was heavily influenced by slave songs and music as well.
We humans today are so much closer to each other in ways that most of us do not realize.