Gift Of Gab

I don't care what anybody says. California MC Gift Of Gab is the greatest, most versatile, most relevant, most skilled, most, well, gifted MC in hip hop music. Ever. If anyone wants to argue this point with me then bring that shit on. I will take you down.
In this above video (which took me a long time to choose from so many possibilities) he demonstrates why, it's the title track from 2009's The Craft, in my opinion, the best album of that year and their Blackalicious' best album to date. 
He is the creator of so many of the freshest and most original rhyming techniques, and continues to do so whilst serving up the most intelligent, insightful lyrics in hip hop.
He's not a 'gangsta' and doesn't pretend to be, he doesn't need to rhyme about guns & drugs & bitches. He rhymes philosophically, educating listeners subconsciously while making heads nod to infectious beats, usually provided by Chief Xcel, the other half of Blackalicious.
Working experimantally Xcel challenges Gab with abstract beats and dares him to confront Chemistry as the subject on 'Chemical Calisthenics', or on the track 'Alphabet Aerobics' Xcel provides a rapidly accelerating beat while Gab raps working his way from A to Z with astonishing delivery and enunciation. 
So basically, if you wanna learn to flow, listen to Gab. He has the Gift.