Organizers said Tuesday that Broderick and Kelli O'Hara will perform songs from the Broadway musical "Nice Work If You Can Get It" during the program, known as "A Capitol Fourth."
The performers will take the stage on the West Lawn of the U.S. Capitol ahead of the annual Independence Day fireworks display in Washington.
Turner has had three No. 1 singles on the U.S. country charts, including "Why Don't We Just Dance." His new album, "Punching Bag," will be released Wednesday.
Williams will conduct a performance of his "Olympic Fanfare" alongside Olympians competing in this year's Summer Games.