The Chainsmokers Bring Out Desiigner, Perform 'All We Know' With Phoebe Ryan at ACL Fest 2016

The Chainsmokers have held the No. 1 song in the country for over a month now with "Closer" and, boy, they made sure to act like superstars at the top of the world with their set at Austin City Limits Fest 2016 that included surprise guests, live song premieres and a general sense that were going to 100 percent enjoy the moment.

Andrew Taggart and Alex Pall kicked off their set just as the sun was setting over Austin's Zilker Park, bringing fun remixes of Kanye West's "Love Lockdown" and KISS' "I Wanna Rock N Roll All Night." But the massive crowd was clearly here for Andrew and Alex as they gave whoops of approval the moment they heard the initial beats of "Roses"—the duo's breakout smash from last year—singing along to the "Say you'll never let me go" hook.