34. Schoolly D, 'P.S.K. What Does It Mean?'
"This birthed gangsta rap," Questlove said. "N.W.A just took [its] formula and ran with it." The Philly MC got his track's name from a gang, Park Side Killers, and its beat from an evidently stressed-out Roland 909 drum machine. In a lazily menacing flow, he buys coke, beds a whore, buys weed and flashes a pistol. That he decides not to pull the trigger makes the jam no less chilling.