My opinion of rap music was forever changed. These were beats I could enjoy. So, I started researching rap. Now, the first rap song ever is pretty much universally known to be Rapper's Pradise by Sugarhill Gang. (You can look that shit up on your own, I hate it.) But according to the most credible source I know. The first rap song was actually called I Am The Judge and it's... hilarious. I'm not overly-fond of it, but I do find it quite amusing.
This is seriously the best recording of it I can find.