Do you remember when your mother told you do not sit in a wheelchair because it is bad luck.
Apparently this young man never has heard that from his mother and I bet that he wishes that he had.
One of my favorite songs of all time and one of the easier songs for me to sing is Amzing Grace. But if you don't know a song I wouldn't suggest you try to sing it, with a room full of people. Lip synching, or mumbling won't help you either. Even if he is singing for God this isnt a good look.