GRiZ performs at the Austin City Limits Music Festival in Zilker Park on Sunday October 4, 2015. JAY JANNER / AMERICAN-STATESMAN

What the hell is funktronica?

That’s best boiled down to when 25-year-old Michigan producer GRiZ grabs a sax and lays a studious solo over his laptop’s pulsing dance tracks. Griz will then splice in Andre 3000, Bee Gees, and Parliament while kids near the portable bathrooms hula hoop. It’s how one blows out the Tito’s tent after two weekends of Austin City Limits.

On this Sunday ACL is offering very different musical experiences. The mainstream parlay of Alt-J then Hozier and finally Florence and the Machine is a huge standalone ticket. Over here I’m guessing people want a last turn-up before getting dirty at the Weeknd.

The suburban Detroit producer born Grant Kwiecinski made it look effortless–and while any herb can lubricate proceedings with some Jackson 5 or “Nuthin’ But a G Thang,” well, all that geeky sax to his credit never got old.

“You are now welcome to the funkiest party in the galaxy,” he said. His sideman Muzzy Bearr–a schlubby dude with a guitar and a beard–strummed frat-house funk progressions, and brought nonstop chill vibes.

The last third of the set began to lose some folks jostling for one final slab of ACL viewing real estate, and also erred mostly on straightforward, bright-lights EDM. It started to hit us.

After GRiZ the Sunday night, “oh man I have to be in early tomorrow” dread sets in. But for now a man wore a tank top that read “Free the Universe.” Piece of cake.