Just before Kendrick Lamar took off for Chicago’s Pitchfork festival, where Lady Gaga popped up solely to see his set, the Interscope signee unleashed a sludgy new single off his forthcoming debut good kid, m.A.A.d. city. Produced by T-Minus (whose recent work includes tracks on T.I., Rick Ross, and Slaughterhouse’s new LPs), “Swimming Pools (Drank)” liberally combines sonic ooze and boozy lyrics with the brilliant, rapid-fire flow that helped earn his section.80 the No. 6 spot on our Best Rap Albums of 2011 list. As the murky backing track implies, this isn’t necessarily a jaunty take on a nonstop summer party — you’ll want to check out his summery collab with Dr. Dre earlier this year to grab a bit more of that vibe. good kid, m.A.A.d. city drops October 2 via Interscope/Top Dawg/Aftermath.