One night late in 2007, I went to see Jay-Z at New York's Hammerstein Ballroom, a small-venue show that was part of the American Gangster release rollout. This was a great show, as most Jay-Z shows are. But the most memorable moment of the show didn't belong to Jay. About halfway through the show, Lil Wayne came out, grinning like a gremlin and loping in this little hop-step, to do "Hello Brooklyn" with Jay. And when the song was over, Wayne grabbed the mic for a quick second. He didn't say anything. Instead, he sang his chorus to "Duffle Bag Boy," a song that was huge at the moment. The crowd reacted like this was a Fugazi show and they were hearing "Waiting Room." In my many years of going to shows, I have heard very, very few singalongs that loud. "Duffle Bag Boy" wasn't Jay's song, and it wasn't Wayne's either. Wayne didn't even rap on the song; he just sang the hook in the beginning of that era when he would sing all the fucking time. The song belonged to Playaz Circle, a little-known Atlanta group that had never scored a hit before and never would again. One half of Playaz Circle was Tity Boi, a guy who'd been on guest-verse duty in Ludacris' Disturbing Tha Peace crew for years and who, other than his goofy-ass name and a brief, ill-advised feud with Trap Muzik-era T.I., had never really made much of an impression. Tity Boi is now 2 Chainz. "If it wasn't for Wayne, it wouldn't be a lot of dudes in the game, including me," 2 Chainz raps in the opening moments of ColleGrove, his and Wayne's new collaborative album. He isn't kidding.