It's a Madlib shoutout to just about everybody who was cool in hip-hop's old skool, from Schooly D and Heavy D to Slick Rick and Biz Markie. Go all the way there and then get back to Ice Cube, Ice-T and Biggie and Tupac. And remember kids: stay in school, the old skool that is. UPDATE: Hey, it's that rap song by Mr. T.