"What... right now?" Iestyn felt put on the spot and didn't even try at first, just turned a bit red and listened to Henry, who had a very lovely, mellow tone. He was clearly very knowledgeable with his Christmas carols, obviously, but Iestyn was too, having sung them all over and over every year growing up.
He didn't think he could do it, but Henry wasn't stopping, so he cleared his throat lightly and tried a few quiet notes. It sounded raspy and unpleasant to him, and he stopped. "I can't do it."