I don't think rap is music. It has no melody which is necessary for music.
It's a bundle of statements, it's a rhytmic sort of speeching. I's vocal acrobacy, not music.
Martin Luther King did the same with his speeches: rhytmic and timed speaking.
Rap and hiphop:Tho' it's OK by me, but I still don't agree, one can do whatever he wants.
But don't tell me that it's music, because it isn't.