Country singer Blake Shelton brought a 6-year old boy, Wyatt McKee, up on the stage at his concert in Durant, Oklahoma, to join him for a duet of “God’s Country.”

Wyatt, who is in need of a heart transplant, held up a sign up during the concert which said, “Your smallest, biggest fan from Lake Texoma, 6 years old waiting on a heart transplant,” and asked if he could sing “God’s Country” with Shelton.

“Think y’all are having a bad day, put that into perspective right there, man,” Shelton told the crowd as he kneeled next to the boy.

The two then proceeded in signing the song together and after a while Wyatt headed back to his seat, but not before Shelton told the crowd to applaud him, “Y’all give a big hand for my friend Wyatt!”

The sweet moment between the boy and the singer was captured by Wyatt’s mother Harley McKee in a video, which she later shared on Facebook. Harley captioned the clip, “I don’t know if Blake Shelton will ever see this but I just want to let him know he is awesome and officially my favorite person he absolutely made Wyatt’s day thank you so much to him and everyone who stopped us to tell him how great he was on stage and told him they are praying for him!!! Definitely, a night to remember!!! #WyattStrong.”

The Voice coach retweeted the video and added, “This little buddy made my night. Thank you for singing ‘God’s Country’ with me Wyatt!”

Harley told Music Mayhem that Wyatt has already had two open-heart surgeries and is on a transplant list, as well as a “new medication that requires him to have a long term IV in his arm and a backpack with medicine that runs continuously.”

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