When one patriotic customer burst into a rendition of “The Star-Spangled Banner” in a Texas Walmart store over the Independence Day weekend, it set off a chain reaction. Within seconds, other shoppers with their carts joined in and began singing, forming a spontaneous choir that brought tears to the eyes of many. A Walmart customer named Cody Bill Schrage managed to film the patriotic moment and shared the moving clip on Facebook. It all began with one shopper with her hand on her heart, singing the national anthem as she stood beneath a large American flag at the entrance to the Haslet store. “I was waiting on my wife to get to the checkout. I heard a lot of singing around me,” Schrage, 50, told The Epoch Times. “I walked a few yards to check it out, and that’s when I saw all the people coming together as one, singing …