Musical cast and crew continued a Greenwood tradition Friday, serenading classrooms as they marched the halls before opening night. C0-directors Ms. Osborne and Mrs. Cassady led the march through the halls, singing “Supercalifragilisticexpialidocious” from “Mary Poppins.” The musical opens its three-day run at Van Meter Auditorium on WKU’s campus tonight at 7 p.m. Tickets are $10.