>what I'M talking about is you don't write out a Hip-Hop song
>on sheet music.

(not necessarily that you DON'T, but rather that you CAN'T. It requires an entirely new notation to itself, one that still hasn't been completely successfully developed; that can't be said about most other musical systems which use different notations in their indigenous settings but can still be represented by/transliterated to Western notation if necessary.)

that hip hop did not represent a natural progression in musical evolution, but rather a break from musical continuity; ground zero of an entirely different evolutionary tree.

Which was mostly disagreed with.