Impressive. My "Turn it off turn it OFF!!!’ reflex kicked into full force by 20 seconds in.
I don’t really have anything to add, but I’m reminded of the Waltzing Matilda pop-up video for the 2000 summer games.
“First time singing on national television.”
“Last time singing on national television.”
Not a musical bungle perhaps, but do we get to count the err… “wardrobe malfunction” of Lucy Lawless while singing the US anthem at an NHL game? 
guizot
23
And if you do have the anthem sung, make sure the person singing it can hit all the notes. It’s not an easy song to sing well.