Def Jam, Young Money, and Roc-A-Fella might be laughing all the way to the bank.
My classics teachers mentioned the possibility of musical accompaniment, and length instead of stress oriented metres would also point in that direction?
[Edit: cf https://en.wikipedia.org/wiki/Dithyramb ]
(ancients also wrote poetry so the text of the words formed an image, which the Victorians considered Not Real Poetry. compare http://99-bottles-of-beer.net/language-javascript-1948.html )
I could just as easily say: all this modern stuff isn't poetry either. Poetry always rhymes.
Oh wait - some people get to break the rules and others don't?