The classic song is performed by two boys - after a while a total laugh chaos breaks out in the audience
The higher the two boys sign, or rather "meows" during the choir at church comes as an total chock to the audience who can't stop laughing at it. Even though the audience laughs, the boys manage to remain calm and isn't moving a flinch.
This is what we would call for singing in a really professional level. A big round of applause to these boys for the performance!
Watch the clip below with the boys: