I would say that Hip Hop music (aka rap) is not just been influenced by poetry, but that it is a form of poetry, which I think is a common view in the Hip Hop community.
I would recommend including Tupac in your dissertation and maybe doing a similiar survey on the Tupac sub, besides being the probably biggest influence to Kendrick, he is an intersting case on that topic because he went to the baltimore school for the arts which had a focus on things like poetry, so he had an understanding for classical poets and poetry
There are many videos were he talks about the connection of poetry and rap like for example https://youtu.be/cGlPgh3hBbU?t=52 and youtube.com/watch?v=5t9QBfZLn4A
Also there a classical poems written by him https://allpoetry.com/Tupac-Shakur, here is a book with a collection of the hand written notes amazon.com/Rose-That-Grew-Concrete/dp/0671028456
2Pac beat you to it bro
https://www.amazon.com/Rose-That-Grew-Concrete/dp/0671028456
[he was a Brilliant poet] https://www.amazon.com/dp/0671028456/ref=cm_sw_r_cp_apa_i_bx-3DbB0048PS)
Screw it, I suck at html.
Also, I thought it was very racist to charge him for this event, even as a 14 year old at the time. Weird that putting a brilliant man behind a cage made him angry. Had he not been forced to hang out with uneducated gangster who sucked him into thug life, he may have prevented a lot of the national racial strife that continues to linger today.
I think that is what we call institutional racism, where the racists didn't like his popularity, so they damaged a brilliant man. Great job society, now let's smear him from the grave!