RASCAL FLATTS ARE HILARIOUS IN THIS "HUM-OFF". (WATCH)

As Rascal Flatts get ready to release their 10th studio album Back To Us, they continue to make the media rounds.

The trio was recently asked to have a "Hum-Off"?

It's as silly as it sounds, each member hums the tune of a famous song, while the others have to guess what it is.

It's hilarious!

The new album Back To Us is out May 19th.