The "American Idol" alum performed a cappella when her backing music refused to take the wheel. Country singer Carrie Underwood gave an impromptu a cappella performance of “America the Beautiful” at Donald Trump's second inauguration ceremony on Monday when technical difficulties prevented her pre-recorded backing music from playing.

Carrie Underwood was forced to sing a capella at Trump's inauguration on Monday, after the music track for her wouldn't play.

The 'American Idol' alum said she was "honored" to be asked to perform at Trump's inaugural Carrie Underwood honored the new president with a rare political performance. On Monday, Jan. 20, Underwood,