Before they were the three bad brothers you know so well, Beastie Boys were a hardcore punk band who idolized Washington D.C.'s Bad Brains and opened for them the night Max's Kansas City shuttered in December 11, 1981.

An old ad claims there was supposed to be another show by a different lineup on Dec. 12, but until there's some verified proof that The Rattlers and Ronnie & The Jitters played on 12/12, this writer will claim the 11th the night the fabled Manhattan club had its farewell show.

The Bad Brains were known for playing extremely fast punk rock and could stop on a dime and switch over to mellow reggae.

"It's like punk rock morphed into what the kids called hardcore," Bad Brains bassist Darryl Jenifer told Rolling Stone in 2016.

"But for us, it was just punk. We just played fast. When you're young, shit's competitive. 'If other people think you're playing fast, watch this.' At the time, people were playing at the speed of the Ramones, which wasn't that fast. Then the youth movement started to build on that.”

Part of that youth movement were the Lower East Side hardcore band Beastie Boys who had not yet included King Ad-Rock, and instead had John Berry on guitar and co-founder Kate Schellenbach behind the drums.

The Beasties' inaugural show was in August, 1981, which meant they were just two months old when they found themselves opening for the well-established Bad Brains.

This is not out of character for Max's at that stage of its life. It was over for the once hip restaurant and nightclub on Park Avenue which in the '60s and '70s. In fact in 1970, The Velvet Underground held their last show at Max's..

But for the Beasties it was just beginning. There's very little about 1981 Beastie Boys that sounds like what audiences would gobble up in record-breaking numbers off their 1986 debut License to Ill.

This is 16-year-old Mike D and 17-year-old Adam Yauch giving it their all as fast and as loud as they could.

Most of the songs played that night at Max's can be heard on the Polly Wog Stew (1982) EP or on the Some Old Bullshit (1994) compilation.

Of note in this set is "Egg Raid on Mojo," which the group stopped playing when they first started rapping, but put back into their shows in 1992 and ended up performing over 200 times as a nod to their hardcore past, and a way for the crowd to really get loose.

Binky Philips worked at the St. Mark's Sounds record store in the East Village in the early '80s and knew the Beasties, and the scene. He remembers when they delivered 10 copies of Polly Wog Stew to him and cracked up when he first heard it.

"They left and I put it on the store’s stereo – within a minute, we were all howling with laughter," he wrote. "They had turned punk into a Bugs Bunny cartoon. 'Egg Raid on Mojo' was about another one of our regular customers. Mojo was a large, gregarious, handsome, dark-skinned, ska-styling doorman at several hip downtown boites. He was a genuinely okay guy, but his gig led to him having a bit of a lame 'I’m hot and I know it' attitude. The Beasties would have none of that, and the song describes actual events.

Which means they dissed poor Mojo from 1981 at Max's (where they seem to have live-debuted it) to 2009's Bonnaroo, their last show due to the fact Yauch aka MCA had fallen ill and would pass away a few years later.

At that Bonnaroo show, they segued quickly from "Egg Raid" to "Body Movin'" the second single from 1998's triple platinum, chart-topping Hello Nasty showing both how far they've come and yet how much energy and creativity remained from their teen years.

Neither the Beasties or Bad Brains have any tour dates on the horizon.

But earlier this year Ad Rock says there will be unreleased music one day.

"We actually have a whole full album. I'm not even kidding," the rapper said in the podcast Kreative Kontrol.

"We have a bunch of rap songs also that never came out, but the bulk of it is stoner jams," he continued. "I don't know if the world … really needs that right now — but maybe they want it? I don't know. They're going to get it, at some point, because I'm going to put it out."