Rascal Flatts

From seasoned legends to tween newcomers, the country music pool diversified hugely in the first decade of the 2000s -- not only in demographics but also in sound.

"Our timing wasn't the greatest, either, because we came in right at the end of the boy band stuff ..."

Be still, my heart!

Is this the end?

Such a funky performance!

Together they'll perform "Go Tell It on the Mountain."

Sure, some of these artists have won Grammys -- but the best kind of "grammy" is the kind that makes you home-baked chocolate chip cookies.

"I looked the other day, and their first single came out in 2000," he points out. "Here it is, 2019, and ..."

They're in this until they can't anymore.

Remakes, also commonly known as cover songs, go all the way back to the earliest days of popular music and have stretched across myriad musical genres.

Still, there's one aspect of their career that the group definitely wants to retire from one day.

Mom, Mother, Mama, Mommy -- whatever she's called, she's played an integral role in these country stars' lives.