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Country music will be part of America's 250th birthday celebration on the biggest stage in the country.Zac Brown Band and The War and Treaty will perform at "The Great American Block Party 250," a three-hour live primetime special airing July 4 from 8 to 11 PM ET on CBS. The show will stream simultaneously on Paramount+ and CBS News 24/7. Tony Dokoupil and Nischelle Turner will host live from the Washington Monument.The night ends with what organizers are calling the largest fireworks show in history over the skies of Washington, D.C.For Zac Brown, this is another chapter in a year where he has refused to miss a single moment honoring this country. National anthem at the White House. Now July 4 on CBS. The man keeps showing up.