The 4th of July fireworks and concert in Boston is recognized around the country as one of the biggest and best celebrations of America's independence. Here's what to know about the Boston Pops Fireworks Spectacular event Friday on the Charles River Esplanade.

In the weeks leading up to the holiday, Gary Souza and around 60 fellow pyrotechnicans are focused entirely on finalizing the 49th annual Macy’s show. But they are not strolling along the Brooklyn Bridge where it will take place, nor are they balancing aboard one of the four barges in the East River that will supply additional launch points.