When Nirvana took the stage of the Sony Music Studios in New York City on Nov. 18, 1993, their third (and ultimately final) studio album In Utero was only two months old.

Their second album, 1991's Nevermind, had seemingly changing the face of popular music overnight, leaving the band to wrestle with its new fame. They were punks, after all, and anything that even suggested the mainstream was to be treated with mistrust. Nirvana, and especially frontman Kurt Cobain, tried to deflate their massive popularity every opportunity he got.

So, when they began work on the follow-up to Nevermind in February 1993, the idea was to record fast, loud, hard and with no rules. And, apparently with no producer, either: Steve Albini, the man who recorded the album, did little to wipe away the music's abrasiveness.

There followed some back and forth between the band, record company and Albini – and also producer Scott Litt, who was brought in to soften some of those rough edges. In Utero was released on Sept. 13 and, not so surprisingly, debuted at No. 1. While making the promotional rounds for the record, MTV proposed filming the group for its popular Unplugged series. After much back and forth (again), Nirvana agreed to sit down, strip down and play some songs.

But Nirvana had no intentions of playing MTV's game. They picked a setlist short on the actual songs that made them huge: So, no "Smells Like Teen Spirit," and no "Heart-Shaped Box." They invited people onstage to jam with them (namely, the Meat Puppets) that were far from the alt-rock royalty the network was hoping for. And Cobain, even though he was playing an acoustic guitar, wasn't technically unplugged: he ran his instrument through an amp disguised onstage.

And unlike most other bands that sat down for Unplugged sessions, Nirvana performed their 14-song set in one take. The result was a stark, scary and scar-revealing portrait of an artist verging on collapse. You can hear it in the primal shakiness of Cobain's voice, a haunted instrument of torture and unease. (He reportedly was going through drug withdrawal at the time.) It was a pivotal moment, both for the group and in rock history.

Watch Nirvana Perform 'Man Who Sold the World'

During their nearly hour-long performance, Nirvana played only a handful of their own songs; "Come As You Are" was the most popular. Instead, they focused on covers of cuts by their onstage pals the Meat Puppets (three songs), Lead Belly (a harrowing take of "Where Did You Sleep Last Night" that ended the show) and Scottish rockers the Vaselines, plus a stripped-down version of David Bowie's 1970 track "The Man Who Sold the World," which found a new audience of fans following Nirvana's cover.

The episode aired on Dec. 16, 1993, about a month after it was recorded. Within six months, Cobain was dead. In the weeks after his April 5, 1994 suicide, MTV showed Nirvana's Unplugged almost nonstop. Hoping to cash in on Cobain's death, the record company enlisted surviving members Dave Grohl and Krist Novoselic to assemble a live album from the band's tapes. They weren't emotionally prepared to sift through their archives, so instead the Unplugged program was scheduled for release.

MTV Unplugged in New York came out on Nov. 1, 1994, and immediately shot to No. 1. "About a Girl" and "The Man Who Sold the World" received extensive airplay. A somber, cello-assisted version of "All Apologies" from In Utero served as this project's penultimate track, then became a fitting requiem for Kurt Cobain.

Two decades later, the raw, savage music sounds like it's peeling away at layers of wounds, even without its tragic history in hindsight. No other Unplugged outing comes close to the sheer nakedness that Cobain exhibits on MTV Unplugged in New York. He's ravaged, torn and frayed.

This isn't a celebratory recording by any means. But MTV Unplugged in New York is one of the most primal and cathartic records ever made, even as it cuts into its heart of darkness.

Grunge Pre-Nirvana: 20 Things That Set the Stage For ‘Nevermind’

The bands, people, places and trends that paved the way for grunge's landmark album.

You Think You Know Nirvana?

More From Ultimate Classic Rock