UPDATE: Dave Grohl Wrote a Theme Song For the 10-Year-Old Girl He's Been Engaging In Drum Battles

10-year-old drummer Nandi Bushell challenged Dave Grohl to a drum battle... now he's written her a song befitting of a young superstar.

Over the past few weeks, Foo Fighters frontman Dave Grohl has been in an ongoing drum battle with a 10-year-old girl.

Now he's really gone and raised the bar, penning one awesome song for England's Nandi Bushell.

The big drumming challenge began when Nandi challenged Grohl to drum to his own hit song "Everlong." Grohl then responded with "Dead End Friends" by Them Crooked Vultures.

When Nandi matched him beat for beat (seriously, she's an incredible drummer), Grohl took things like a champ, admitted "you got me," and conceded defeat in round one of their competition.

Then he wrote Nandi a theme song befitting of a young superstar.

Why? "Every superhero needs a theme song," he says.

Ok @Nandi_Bushell....Round 2! Every superhero needs a theme song. Here’s one for you! Mad props to The Grohlettes for the background vocals. pic.twitter.com/js9xBasbpw
— Foo Fighters (@foofighters) September 14, 2020

Ok @Nandi_Bushell....Round 2! Every superhero needs a theme song. Here's one for you! Mad props to The Grohlettes for the background vocals. pic.twitter.com/js9xBasbpw

Grohl didn't perform the song alone. Oh no. His three adorable daughters, "the Grohlettes" perform backup vocals.

WATCH: Dave Grohl Accepted This 10-Year-Old Girl's Virtual Drum-Off Challenge–And It Wasn't As Easy As it Sounds

Cue the whole world turned into Grohl—and Grohlettes!—super-fans.

The lyrics Grohl made up came "off the top of my head." And how do they go?

"She got the power/She got the soul/Gonna save the world with her rock & roll!"'

The words don't stop there. "Nandi, the No. 1 supergirl / Nandi, the best drummer in the world / Nandi, always right on time / Nandi, hero wunderkind," he sings.

So what did Nandi think about getting her very own tune? She described it on Twitter as "the best song EVER, in the WORLD, EVER!!!"

Have a listen and see what you think.

I cant believe Mr. Grohl wrote a song about me!?! This is so so so #EPIC!! I think its the best song EVER, in the WORLD, EVER!!! Thank you so much Dave. You have raised the stakes to all instruments! I accept your next challenge! Thank you to the whole Grohl family! @foofighters pic.twitter.com/rWgTBwEtyb
— Nandi Bushell (@Nandi_Bushell) September 14, 2020

I cant believe Mr. Grohl wrote a song about me!?! This is so so so #EPIC!! I think its the best song EVER, in the WORLD, EVER!!! Thank you so much Dave. You have raised the stakes to all instruments! I accept your next challenge! Thank you to the whole Grohl family! @foofighters pic.twitter.com/rWgTBwEtyb

We look forward to seeing what's next for both superstars.