Underwood's performance experienced technical difficulties, leading her to sing a cappella. She asked the attendees to join in. "You know the words," she said. Michaels Wolflick p

Katy Perry, who was a judge on our show, sang at the last inauguration as well, so isn’t that great that two American Idol judges sang at the last two inaugurations. Megan Michaels Wolflick also pointed out that Carrie Underwood “handled very well” the technical difficulties her inauguration performance faced.