Last night, EDM court jesters the Chainsmokers played at South by Southwest, the destination of all things authentic and cool. Our pal Chris DeVille at Stereogum went to the show, where he witnessed something very wild: the Chainsmokers flipping their mega-hit “Closer” into a cover of Smash Mouth’s “All Star.” Watch it below.

The Chainsmokers performed a very special version of “Closer” last night pic.twitter.com/zm2k3PX50Q

— Chris DeVille (@chrisdeville) March 17, 2017

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Here they are doing straight-up Red Hot Chili Peppers karaoke:

And they say rock is dead 😂 #TheChainsmokers

A post shared by Stereogum (@stereogum) on Mar 16, 2017 at 11:36pm PDT

Pretty fucked up. Read Stereogum’s full review here.