Here’s what it takes to set up fireworks for the the Boston Pops

That performance will be the biggest fireworks display Boston will have ever seen, with 4,500 individual explosions in honor of the country’s 250th anniversary. And for the first time, according to organizers, those fireworks will be choreographed to live music from the Boston Pops. The fireworks, fired by radio control from mortars on barges moored in the middle of the river, are meticulously set up, timed, and harmonized with each other. The 59-year-old pyrotechnics manager for the event, Shea said he and his team have spent months putting the program together. “This is just a really big year for Boston,”…