The country music singer is known for hits like “Courtesy of the Red, White and Blue” and “I Love This Bar.”
The Oscar-winning actor, who’s been in movies Midnight Cowboy and Deliverance, is also the father of Angelina Jolie.
Tony winner Holliday, who played Effie in Dreamgirls, initially defended her decision to perform at the concert.
“I’m singing on the mall for the people,” she told BroadwayBlack.com. “I don’t have a dog in this fight — I’m just a singer, and it’s a welcome concert for the people on the mall.”
But on Saturday she announced was pulling out of the concert, citing her desire not to upset her LGBT fans.
The Utah-based group gained popularity on YouTube for their piano and cello renditions of popular songs and classical music.
The man behind “God Bless the USA” tweeted, “I believe this is a time to pray for & support our country & new President” after the news broke.
The Indian-American DJ and drummer won the 2010 People’s Choice Award for World’s Best Innovative DJ/Drummer.
The band is best known for their singles “Kryptonite” and “Here Without You.”
BuzzFeed News reached out to the representatives for all of the above celebrities to see if they had a further comment. None immediately responded.
This post has been updated to include Jennifer Holliday’s confirmation that she’s performing and a quote.