August 22, 2013 Roswell – Natalie Tilly holds her flag as she participates in drills during marching band practice at Centennial High School in Roswell on Thursday, August 22, 2013. This year there are 105 students in the marching Knights whise halftime show entitled The Anatomy of a Great Musical includes music from Phantom of the Opera, Hairspray, Westside Story and Les Miserables. JONATHAN PHILLIPS / SPECIAL