A Capitol Fourth is broadcast by PBS, the U.S. public television network. The annual Independence Day concert is presented from Washington, D.C., traditionally on the west lawn of the U.S. Capitol.
The program combines orchestral music, popular performances, patriotic songs, military pageantry, and a fireworks finale. It is also simulcast by NPR and the American Forces Network, but those are distribution partners rather than the public television network named in the question.
The tradition grew from National Symphony Orchestra Independence Day concerts that began on the Capitol grounds in 1979. The first televised concert followed in 1981, and the special has remained one of PBS’s best-known annual broadcasts.
A common mix-up is confusing A Capitol Fourth with Macy’s Fourth of July Fireworks, which is a separate New York City event televised by NBC. A Capitol Fourth is associated with the nation’s capital and public television.