If that's true, then there would be no Elvis. Elvis liked blues and played it. Just because he was white doesn't mean he's any less then any normal blues player. I don't think of race when judging anyone from Elvis to Robert Johnson or BB King.

And as far as Eminem goes, rap has been popular since the early 80's, so I highly doubt he was thr white savior.

And Jesus probably wasn't black. He was Hebrew and if not white would probably be Middle Eastern, but now we're getting ridiculously off-topic.

Bottom line, in the 50's/60's, you didn't have to be black to appreciate or play depressing music.