Carrie Underwood performed a stirring a cappella rendition of "America the Beautiful" after the official swearing-in of President Donald Trump at his inauguration on Jan. 20.

Carrie Underwood's performance at Donald Trump's inauguration was interrupted by an audio error, prompting the Grammy winner to sing a cappella.

Carrie Underwood handled a musical mishap at the inauguration of President Trump like a pro, improvising and singing a cappella after the soundtrack didn't play.