Lil Nas X and Billy Ray Cyrus are doing more than defying Billboard's rules; they're also having people reminisce about an old collaboration with Nelly and Tim McGraw.

Over a week ago, Billboard removed Lil Nas X's "Old Town Road" from its Hot Country Songs chart, citing that "it does not embrace enough elements of today’s country music to chart in its current version," as Blavity reported.

On Thursday, Lil Nas X reassured us that he's not taking the challenge lightly. After Billy Ray Cyrus tweeted his support to the young Atlanta country rapper, he incited the help of social media to secure a collaboration with the "Achy Breaky Heart" country legend.

BILLY FUCKIN RAY!!! ????⚡️

A post shared by Lil Nas X (@lilnasx) on

Lil Nas X confirmed with Time that he considers his song to be of the blended genre. “The song is country trap,” he said. “It’s not one, it’s not the other. It’s both. It should be on both.”

As Blavity detailed, the duo released their song to much praise and excitement. Many are questioning what Billboard will do now that the two genres "outlaws" have teamed up.

As people shared the new song, pretending to own cowboy hats and a horse, they also remembered one unforgettable country-rap duo: Nelly and Tim McGraw.

The 2004 collaboration between the two, "Over and Over," came at a time when Nelly had established himself as a rapper but was just beginning to explore his country roots. McGraw, already a legend, was also sought out by Nelly.

"So he'd written this song and the first thing Nelly did was tell his manager to call me," McGraw told MTV News in 2004 about the unexpected collaboration. "If you know Nelly, he's such a great guy, I couldn't wait to work with him."

"I get in there and say, 'It ain't nothin' country about this song,'" McGraw added. "But it was fun to get in there and sing with him. People are really liking the song, so we'll see what happens."

The song would be labeled both pop and country rap, but it appears Billboard didn't consider it country then, either. The country rap song wasn't the first of its kind, but it was the one we hold near and dear. 

The actual originator of the musical genre is debatable; some credit the early 1900s artist Woody Guthrie, but Kid Rock's "Cowboy" is among the first to be officially credited. Nelly, Bubba Sparxxx and Young Thug are among the most popular artists believed to have expanded the genre, as well.

"Over and Over" hit No. 1 on U.S. Billboard Hot 100, peaked on over 10 international music charts and went platinum in the U.S. and double platinum in Australia.

The memory is making Twitter fall for the sweet smell of old facial bandages over and over again.

When the music hits, it just hits.

Now, check these out:

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Billy Ray CyrusCountry Raplil-nas-xnellyNostalgiaTim McGrawTWITTER