"American Idol" runner-up David Archuleta is joining R&B legend Gladys Knight at the annual July 4th holiday concert in Washington D.C. "A Capitol Fourth" will air live from the west law of the Capitol at 8 p.m. ET on PBS stations across the country.
Jimmy Smits is hosting the event and Reba McEntire, Darius Rucker and the National Sympathy Orchestra are also scheduled to participate in the patriotic festivities. This is the 30th anniversary of "A Capitol Fourth." It always ends with a length fireworks display.
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