After the Fourth of July, all the good viral holiday videos start rolling in. This one is of a patriotic flash mob in a Cape Cod Stop and Shop grocery store. Everyone is shopping and getting ready for their holiday weekend when all of a sudden a drummer starts drumming. Then a trumpet joins in. Soon an entire marching band is playing the classic American Fourth of July tune, Stars and Stripes Forever. More and more band members keep showing up, and the crowd just loves it, clapping along.