4 Year Old Recites Bible Books and Covers George Strait

During his preschool graduation, a 4 year old in Mississippi made his teacher as well as his parents as proud as they could be with his ability to recite all the books of the bible's new testament in order... But then follows with a surprise of his own.  

As the preschooler displayed his memory skill to the congregation in attendance, he throws in a little surprise at the end.  Adding a little George Strait tune to his remaining available mic and stage time.  At least until his teacher cuts him off.

But I'm wondering if it was a family member who put him up to it the tune?  Or if it was something he thought of on his own?  Either way, the video is incredibly cute!