Joyce Joyner, right, plays the lead role of Maria in the Sound of Music” to be presented at Thornridge high school auditorium April 27-.‘tO by the Thornridge Speech and Music departments. Joyce is pictured with the seven children of Captain Von Trapp, played by Bob Caroli. Maria, a young postulant, leaves the conventto become governess of the Von Trapp children.Starting from the top of the stairs, the Von Trapp children are Liesel, played by Carolyn Toth, Fredrich by Terry Frank. Louisa by Cheryl Toth. Kurt by Victor Joyner. Brigitta by Robin McConnachie, Marta by Angela Behn and Orel I by Renee Pusateri.