Bloc Party frontman Kele Okereke looked like he was ready for a very political game of basketball. Dressed in brightly colored shorts, vintage Nikes and a Barack Obama T-shirt with the word “Progress” written on it, Okereke and his band managed to overcome some technical glitches and the absence of bassist Gordon Moakes (he’s at home with a new baby) to deliver a set of inspired stadium-sized dance riffs as the Chicago sun set. The band really clicked the new single “Mercury” (where Okereke sampled his own voice) and on the set-closing “Helicopter” (which was greeted as a true anthem). During some down time, Okereke even teased the opening riff of Nirvana’s “Heart Shaped Box,” which was a knowing nod to Lollapalooza’s early-’90s roots.

More Lollapalooza Coverage: Rock ‘N’ Roll Diary