This thread merely points to the continuing reality of structural racism in the entertainment industries..
Everybody keeps saying, "We're talking rock" then mentioning some non-rock genre more or less better represented by black folks. The reality is that there isn't necessarily a lack of black punk, metal, or rock bands, its that these bands don't get the kind of coverage and exposure which bring them to the spotlight. We can't name them because a racist structure has prevented our exposure to them..
So black folks are as involved in rock music as any other group, but the system itself favors selling this music as a non-black entity!
Also we see the dynamics of social racism, many of our scenes are not as integrated racially as are our societies, so there isn't enough interaction to create more bands with black folks represented, because socially blacks and whites aren't getting along as rosily as we'd hope! In fact, many studies are finding we are inching back towards social segregation which is kind of scary