The Sound of Freedom

With the Capitol in the background, sound technician Steve Weinkamp of Baltimore puts up a microphone during a dress rehearsal for a fireworks show and concert. As the nation marks 237 years of independence, thousands of Americans were to gather on the National Mall to watch a 17-minute fireworks display. (AP Photo/Susan Walsh)
With the Capitol in the background, sound technician Steve Weinkamp of Baltimore puts up a microphone during a dress rehearsal for a fireworks show and concert. As the nation marks 237 years of independence, thousands of Americans were to gather on the National Mall to watch a 17-minute fireworks display. (AP Photo/Susan Walsh)