I have heard the term "Black Singers" for the Welsh?

I think black singers from Wales are just that - people who are black of skin and hale from Wales, like Shirley Bassey (my, what a voice). Presumably descended from immigrants from Africa or America [ie Afro-American] in the last 100 years or so (not before... I used to like the Spanish Armada theory because my mum's family are Cornish - black Cornish - meaning they have olive skin, and I loved the romantic idea of Spanish sailors being rescued... *sigh*)