You mean the "music" that advocates killing women, police officers and routinely uses racial slurs? I'm sure that will be exempted as freedom of artistic expression.
What would be funny is for some brave student to stand on the rotunda steps and simply read the lyrics of some obscure rap song. And then when hauled up on charges, he could just bring in the CD and explain that he was just, "keeping it real."
I should have put rap "music" in quotes. Of course my opinion on the subject isn't worth much. I remember confidently predicting that rap "music" wouldn't last 6 months.