How can I get my sister more into rap and hip hop culture?

She likes Hip hop and rap but she mostly likes rock and considers herself a rocker...She's already taken the first step and now likes Black eyed peas beyonce rihanna kanye west flo rida soulja boy fergie and more but is still a rocker...how can I get her more into hip hop and rap and less into rock...Can I PLEASE have real straight answers and no bull please! Thanks!