So when a black woman sings a song written by a white woman, the white woman is guilty of cultural appropriation?

I’ll grant you that Black musical Artists have frequently been cheated or underpaid on royalties for the music they have created. But we already have a word for that. It's called "copyright infringement" and we don't need a separate term for copyright infringement when it happens to black artists. Most importantly, it was those individual black artists who were cheated, not black people in general. With Led Zeppelin stall Lightning Hopkins riffs, they were cheating black people. They were cheating Lightning Hopkins.