This 2-page comic was done for a VH1 documentary called NY77: Coolest Year in Hell. The documentary itself wallows in a bit of nostalgia, which I will admit I am guilty of myself when I think back to my NYC 1970s childhood, but shit. . . a hip-hop battle in comic form? Who drew this? I want a whole series!
You can watch the whole doc here: http://vimeo.com/6909980
EDIT: There IS whole series, Ed Piskor’s Hip Hop Family Tree.