A drum and bugle corps is similar to a marching band but it only has brass instruments, percussion instruments, and color guards. Armies used signal drums and bugles as signals for centuries. The modern drum and bugle corps came from military drum and bugle units coming back from World War I and the wars after it. Early drum and bugle corps was a year-round activity, where musicians performed at shows all the time. Now, most drum and bugle corps schedule tours during the summer, where they travel around the country, performing a new show every year, with different music and movements.