the only bands i like with a black member are the libertines, bloc party, the go naturals, the noisettes and blah blah blah. yet im not racist in anyway. i think there is a slight self fulfilling prophecy here, young black children are growing up to see a rock industry dominated by white people, so their bound to go into a musical industry where the majority are their own creed, such as R'n'B. of course there are notable exceptions and there isnt a set design to this, its just the way it generally goes.

...you know its gone downhill when you have cunts like this^
im sorry did you take offence to something i said? please enlighten me on how im being racist?

That and the fact that people are more likely to excel in what they already know. As far as black people go, the majority in Britain live in the biggest cities, and usually in areas where they'll be most exposed to 'urban' music (by which I mean hip-hop, R'n'B, Drum'n'Bass and also a bit of funk, blues and soul etc.). Most black kids' parents don't listen to much rock music of any kind, so its unlikely that their kids will develop a taste for this loud, guitar and drum driven style. If they don't develop the taste for it then they're not likely to want to perform it and if they turn out to have some kind of musical talent, they'll choose a different style in which to express this talent.

A similar thing can be seen in America too, although I don't have first-hand experience of the ethnic layout there...

Also, as unfortunate as it may be, black people are still more likely to occupy the lower rungs of the social strata (more likely to be poor and/or working-class) and rock music requires decent instruments, speakers and sometimes rehearsal room rental. These cost money, which is more of an issue if you have less of it. Styles like hip-hop, on the other hand, don't tend to require the same financial investment (ok, this argument isn't as strong...)