I've wondered about that many times too... I think RZA didn't write the notes as a whole. He just gave her tips how it should sound to get sound of the Wu and she did it. It doesn't mean that he didn't have a major contribution to this though.
"I know your deeds, that you are neither cold nor hot. I wish you were either one or the other! So, because you are lukewarm—neither hot nor cold—I am about to spit you out of my mouth" (Rev. 3:15-16)