Julian Casablancas played a set with the Voidz at the Beach Goth 4 festival over the weekend, and they debuted a cover of Milli Vanilli’s late ’80s track “Girl You Know It’s True.” Casablancas apparently introduced it as a new song and, judging from the Instagram comments on the performance, a lot of the younger fans in the audience had no idea it was a cover. It happens! Watch some video of them doing it below.

EXCUSE ME WHILE I DIE "Bitch you know it's true." Haha! #jcandthevoidz #juliancasablancas #beachgoth #obervatoryOC #santaana #vsco #vscocam

A video posted by ✨Pearl✨ (@swingpearlswing) on Oct 25, 2015 at 7:06pm PDT

@jcandthevoidz played a new song for us and it was flipping amazing. I'm not alive. #beachgoth #juliancasablancas

A video posted by Stephanie Raygoza (@stephaniegozaa) on Oct 25, 2015 at 10:01pm PDT

NEW SONG! #JulianCasablancas #TheVoidz #BeachGoth #live

A video posted by Emily Q (@grietliebe) on Oct 25, 2015 at 9:14pm PDT

ATTENTION : #juliancasablancas #jcandthevoidz #beachgoth4 @jcandthevoidz #jcvz

A video posted by Divine Ecstacy (@chels_cakes97) on Oct 25, 2015 at 8:26pm PDT

Casablancas also joined the Growlers during their set for a cover of the Doors’ “People Are Strange”:

Growlers ➕ Julian doing a doors cover is the highlight of my night #thedoors #juliancasablancas #thegrowlers

A video posted by Dull girl ☯ (@electric.dazee) on Oct 26, 2015 at 1:53am PDT

People are Strange #TheDoors #Cover #JulianCasablancas #TheGrowlers #BeachGoth #Day2 #ConcertSpam

A video posted by Andy (@oddballandy) on Oct 26, 2015 at 12:52am PDT