I posed the suggestion, a few months back on my "Mumble Rap vs. Conscious Rap" blog, of breaking Hip-Hop down into different sub-genres as it's grown to mainstream popularity. This came about as "mumble rap" has grown it's own subculture fan base. In this video, Murs gives his "3 Lane Theory" of Hip-Hop chronicling the ascensions of the current GOAT's in training, J. Cole, Kendrick Lamar, & Drake. Check it out!