Where did I define rap music?
You're going off the rails here. My point was, which very easily understood by the person it was addressed to, is that Bob Dylan wasn't anywhere close to being the first "rapper".
Modern hip-hop was not started because some kids in the Bronx learned about griots in school and became inspired, so that's a pretty good reason not to take it back that far. They listened to what their parents and grandparents listened to, and developed a new style of music. Let us know when you're done arguing with yourself. Have a beer and relax, it's friday.