The fourth and final production of the Robsham Theater’s fall season is William Shakespeare’s romantic comedy Twelfth Night or What You Will. Fourteen undergraduates comprise the show’s cast, and the production makes no attempt to mimic Elizabethan dress or staging. The set consists of a long swag of patched parachute cloth, and the costumes are “a colorful hodge-podge of styles inspired in part by the Japanese youth fashion trend of harajuku and Diaghilev’s Ballet Russes,” says director Scott T. Cummings, associate professor of theater. Given the musical underpinnings of the play, which begins with the line, “If music be the food of love, play on,” Cummings asked Boston composer Chris Renna to create a score, which he performs live on electric guitar. In this scene from the November 17 dress rehearsal are from left, Sir Toby Belch (Steven Conroy ’10), Maria (Maggie McNeil ’11), Sir Andrew Aguecheek (Shaun Slusarski ’12), and Fabian (Libby McKnight ’11), as they contemplate their next comic scheme.