Pierre Dulaine relishes his role as master of ceremonies for the Dancing Classrooms Philly finals competition, held Saturday, June 6, 2009, at McGonigle Hall, Temple University.  The founder of the program, which uses ballroom dance to instill positive social values in fifth-graders, charmed dancers and audience alike as he shifted from contest director to head cheerleader, goading families in the stands to root for their kids’ dance teams. Watch them “Rock Around the Clock.” 3-minute slide show.