Yeah, and who invented the electric guitar? And what culture does the guitar itself originate from? The simplified answers being Les Paul (a white dude) and European. Even blues itself was a blend of African and European musical sensibilities. Point is, none of this formed in a vacuum, and everything was and is heavily influenced by environment. This is a good thing. Just as 'white' culture is influenced by 'black' culture, the reverse is also true.
And, secondly, saying that 'black' people (as an entire group) invented rock and roll is the same as saying that 'white' people (as an entire group) invented electricity. And, in a slightly less analogous way, saying that 'white' people (as a group) stole rock and roll from 'black' people is the same as saying that black people stole electricty from white people.
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