The Mormon Tabernacle Choir

The Mormon Tabernacle Choir, which has performed at previous presidential inaugurations, confirmed its appearance in December. Shortly after, a petition circulated among people who opposed the performance, urging the group to reconsider. According to reports, the plan to sing at Mr. Trump’s inauguration has caused a rift in the 360-member chorus of men and women, and at least one member has quit. Others are defending the decision to sing.

The Rockettes

The dance company, known for pearly smiles and high kicks, is one of the most recognizable holiday institutions in the president-elect’s hometown. But after a dancer complained that she was being forced to perform, the Madison Square Garden Company, which manages the Rockettes, said that no dancers were required to take part in the event. Since then, the dancers have been immersed in controversy surrounding the particulars of their appearance, and one dancer anonymously leaked behind-the-scenes drama to a reporter at Marie Claire.

3 Doors Down

The platinum-selling Mississippi rock band, known for its early-2000s hits “Kryptonite” and “Here Without You,” will perform on the steps of the Lincoln Memorial the day before the inauguration. 3 Doors Down, which did not immediately respond to a request for comment about the performance, announced its participation in an Instagram post, where commenters quickly staked out partisan positions on the decision (“Well I just lost listening to one of my favorites bands”; “this is why you are my favorite band”).

Toby Keith

The always-outspoken country star will join 3 Doors Down at the “Make America Great Again! Welcome Celebration” on Thursday. Remembered for his aggressively patriotic, often cheeky (and some have said jingoist) post-9/11 songs, including “American Soldier” and “Courtesy of the Red, White and Blue (The Angry American),” Mr. Keith has often performed the role of a red-state emissary to the left-leaning entertainment world, as evidenced in his long-running friendship with Stephen Colbert. In a statement, Mr. Keith said, “I don’t apologize for performing for our country or military. I performed at events for previous Presidents Bush and Obama and over 200 shows in Iraq and Afghanistan for the USO.”

Sam Moore

Mr. Moore, one half of the ’60s R&B and soul duo Sam & Dave (“Soul Man,” “Hold On, I’m Comin’”), will join the lineup for the “Make America Great Again! Welcome Celebration” on Thursday. “As an American, I am honored to perform for President-elect Donald Trump,” Mr. Moore said in a statement. “I was a participant in the civil rights movement and have seen many positive changes and advancement in my 81 years of living in this wonderful country, but I know we must all join hands and work together with our new President. I honestly believe that if we can accomplish this, the best is yet to come.”