In the big leagues of St. Louis hip-hop, the Derrty DJs reign supreme. A loosely affiliated group of DJs, producers and promoters, they are the mainstream tastemakers who often pick the hits. (Hence their motto: "We Run These Streets.") The unofficial leader of the crew is DJ AJ. An accomplished turntablist, he's mostly known for spinning old-school jams on 100.3 FM (The Beat). He's a veteran and one of the true nice guys of the St. Louis scene. He also organizes some of the hottest shows and events that happen in the 314 and the 618. It's no coincidence, for example, that Nelly and the St. Lunatics performed at the Pageant on the final day of the Derrty DJs' annual "Midwest Summit." That's just how AJ and his crew roll.