2021 has already been a big year for I DON'T KNOW HOW BUT THEY FOUND ME and their hit single "Leave Me Alone."

Now, the duo are checking another milestone off of their list. This week, iDKHOW made their late-night television debut on Jimmy Kimmel Live! where they performed "Leave Me Alone."

Read more: Weezer are still planning to play those Hella Mega tour dates this summer

Last summer, iDKHOW unleashed the single "Leave Me Alone" ahead of the release of their debut full-length Razzmatazz. Since then, iDKHOW have continued to have an impressive ride with the groovy new song.

 Billboard

Shortly following the news, Dallon Weekes gave a special thanks to fans and anyone who has been spinning the song and their new album.

Read more: Billie Eilish’s favorite thing about mosh pits may surprise you—watch

Jimmy Kimmel Live!#IDKHOWONJIMMYKIMMEL Twitter

As well, Weekes noticed a very cool coincidence between iDKHOW's late-night debut and when he was last on Jimmy Kimmel Live! with Panic! At The Disco.

"I just learned that five years ago today, I was performing on @JimmyKimmelLive @JimmyKimmelLive
Read more: Did these clues just reveal ‘American Horror Story’ season 10’s theme?

Earlier this week, iDKHOW debuted a beautiful piano rendition of "Leave Me Alone." The stripped-down ballad truly transforms the track into something completely new. Weekes exclusively told Alternative Press that the time spent at home these past few months caused him to revisit some of the songs on Razzmatazz. As a result, he eventually created this new "Leave Me Alone" arrangement.

“Since we haven’t been able to tour, I’ve had a chance to mess around with some of the songs we recorded for Razzmatazz,” he says. “In a normal world, songs will evolve and develop tiny changes night by night when you’re on the road. Instead of that, it’s been mostly playing the songs stripped down for Zoom interviews and Instagram live performances that made me want to try an alternate version. Long story short, I guess it was boredom!”

Read more: Hayley Williams just responded to one of those clues about her new music

For Weekes, he envisions this piano ballad of “Leave Me Alone” eventually slipping into iDKHOW’s live sets when they finally return.

“It was a lot of fun actually,” he says. “To be able to play around with the melody this way. I feel like there is a lot from this version that will drift over into the proper live version of the song when we start playing shows again, God willing.”

What are your reactions to iDKHOW's performance on Jimmy Kimmel Live!? Let us know in the comments below.