Well duh, Rap music started out as an only black thing. It's STILL considered a taboo for white people to even LIKE rap music. When there's a million black ppl doing music when a white person does it theres gonna be that extra appeal because it's fresh and new. Black people usually limit what music they can like to whats mostly black. Black people wouldn't buy a rock album because its made by a black person, they'd just call him an uncle tom. It's not the population it's just whats the base of certain rapper's success. "Let's do the math if I was black I would have sold half". It's easier to connect with someone if they have your skin color. That's not racism, it's just how it is. It's nothing to get mad at.