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

Carrie Underwood is a judge on American Idolnow, and she recently joined a contestant singing Korn and Drowning Pool classics during his audition. The country vocalist became a superstar after winning the fourth season of American Idol back in 2005.

Carrie Underwood has “American Idol” on her side. After collecting backlash for performing at Donald Trump’s second inauguration, which resulted in the star belting out “America the Beautiful” a cappella due to a technical difficulty,