Underwood performed "America the Beautiful" a cappella after an apparent issue interfered with the planned musical accompaniment to her performance.

"I love our country and am honored to have been asked to sing at the Inauguration and to be a small part of this historic event," Carrie Underwood said in a statement to Business Insider on January 14. "I am humbled to answer the call at a time when we must all come together in the spirit of unity and looking to the future."

The "American Idol" alum has largely tried to stay out of politics throughout her career.

"I feel like more people try to pin me places politically," Underwood told The Guardian in 2019. "I try to stay far out of politics if possible, at least in public, because nobody wins. It's crazy. Everybody tries to sum everything up and put a bow on it, like it's black and white. And it's not like that."

Opera singer Christopher Macchio performed the national anthem at the inauguration Monday.

"It is with the deepest humility that I will perform our national anthem, to pay tribute to our great country, and to its newly sworn-in Commander-in-chief, President Donald J. Trump," Macchio said in a statement to BI earlier this month.

A representative for Macchio also confirmed that the singer had performed during an inauguration party at the Trump National Golf Club in Sterling, Virginia, on Saturday, and is also scheduled to perform at the National Cathedral with the Marine Band Orchestra on Tuesday.

In 2020, Macchio sang at a White House memorial service for Trump's younger brother, Robert Trump, per the Associated Press.

More recently, in October, Macchio performed "New York, New York," at a Trump rally at Madison Square Garden.

Lady Gaga performed the national anthem at President Biden's swearing-in in 2021.

Lee Greenwood, best known for his song "God Bless the USA," has long been affiliated with Trump, and has appeared at multiple rallies for Trump. He performed at the Victory Rally on Sunday and again at the swearing-in ceremony on Monday.

"This particular time, we have elected to be live with the United States Marine Corps band, and that's going to have a particularly majestic presentation of my song," he told the Washington Examiner. "It'll be a wonderful appearance."

Gary LeVox, the lead vocalist of Rascal Flatts, confirmed on social media that his band will perform at the Commander-in-Chief Ball, one of three official inaugural balls on Monday night.

"I am so humbled and honored and grateful for the opportunity again to play the inauguration of the 47th President of the United States. I got to play it in 2016 and now Rascal Flatts will be performing at the commanders ball and I am so looking forward to it!" LeVox wrote in an Instagram post.

The band — known for hits such as "Life is a Highway" and "What Hurts The Most" — disbanded in 2021 but announced last year that they would be coming together for a reunion tour to celebrate their 25th anniversary.

LeVox previously performed at the Veterans Inaugural Ball in 2017 without his bandmates.

Parker McCollum has been releasing music since 2013 and had something of a breakthrough in the last couple of years. His single "Burn It Down" was nominated for song of the year at the 2024 CMA Awards.

He is also slated to perform at the Commander-in-Chief Ball.

On January 13, Village People, the '70s disco band known for hits like "Macho Man," announced on its official Facebook page that it would be performing at "various events as part of the 2025 Inauguration of Donald J. Trump."

"We know this wont make some of you happy to hear however we believe that music is to be performed without regard to politics," the group's post read. "Our song Y.M.C.A. is a global anthem that hopefully helps bring the country together after a tumultuous and divided campaign where our preferred candidate lost."

During the Victory Rally on Sunday, Trump danced along onstage as Village People performed their signature song, "Y.M.C.A."

The inaugural committee confirmed the Village People would also perform at the Liberty Ball on Monday night.

The band's decision to perform at the inauguration events is a reversal of its stance from two years ago.

In 2023, the band's manager sent a cease-and-desist letter to Trump's lawyer, requesting that Trump stop using Village People's music and likeness at his events, following an "unauthorized" performance by a cover band at Mar-a-Lago.

A representative for Village People did not respond to a request for comment from BI.

Jason Aldean, who Trump called a "fantastic guy" in 2023, is also set to perform at the Liberty Ball.

The "Try That in a Small Town" musician has played at Mar-a-Lago on New Year's Eve at least twice, per Country Now.

A representative for Aldean did not respond to a request for comment from BI.

Nelly, the Grammy Award-winning rapper, is scheduled to perform at the Liberty Ball.

On Sunday, during a YouTube stream hosted by rapper Willie D, Nelly defended his decision and said that he was "not political."

"Performing for somebody and voting for somebody is two different things. Endorsing people is two different things," Nelly said during the stream.

The "Hot in Herre" singer added that he wasn't too bothered by the backlash he received following the announcement of his performance.

"It is an honor for me to perform for the president of the United States, regardless of who is in office," he said. "If President Biden would have asked me to perform, I would have performed. If Vice President Kamala Harris would have won and asked me to perform, I would have performed."

He added that he wasn't "doing this for money."

A representative for Nelly did not immediately respond to a request for comment sent outside regular hours.

Gavin DeGraw, is expected to perform at the final official ball of Monday evening, the Starlight Ball.

The singer is known for songs such as "I Don't Want to Be," "In Love with a Girl," and "Not Over You."

Kid Rock performed at the 2024 Republican National Convention last summer and appeared with Trump at a UFC fight in November, so it wasn't a surprise that he was tapped to celebrate him once again.

Rock was one of multiple performers at the Victory Rally on Sunday.

A representative for the rapper did not respond to a request for comment from BI.

Billy Ray Cyrus also performed at the Victory Rally on Sunday. This comes after the "Achy Breaky Heart" singer attended a Trump rally over the summer, as seen on Instagram.

His daughter, Miley Cyrus, has previously been a vocal critic of the president, calling him a "nightmare" in 2016, per People.

A representative for Cyrus did not have a statement for BI.