It makes for some wildly jarring juxtapositions, with occasional stumbles into transcendence.

Saturday was different, at least at the south end of Chicagos Grant Park.

Still, they did dedicate England to Mumford & Sons.)

Mumford

Credit: Theo Wargo/Getty Images

Though the impressive crowd gathered clearly adored the big tracks fromGood Kid, M.a.a.d.

city morphed into a sprawling anti-authoritarian howl.

He seemed genuinely surprised and joyful, something the crowd gave right back to him.

He wasnt the only act changing the game on Saturday.

Do you wanna go to church?

he asked, apparently inviting everyone to Our Lady of Strutting and Shaking for a sweaty, funky exorcism.

Then he did a split and bolted for a few minutes to change into a white dinner jacket.

This man was a professional.

Jordan Cook, who records and performs as Reignwolf.

(And honestly, if Lumineers lost power, would anybody notice?)