The Wolf Trap Foundation in association with Foundation for American Dance presents "City Center Joffrey Ballet," by arrangement with Harold Shaw, Robert Joffrey, artistic director, Gerald Arpino, assistant director, William Crawford, general administrator, Walter Hagen, music director, Thomas Skelton, lighting design, Basil Thompson, ballet master, Molle Regan, assistant administrator, Seymour Lipkin, principal guest conductor, Jennifer Tipton, production supervisor, James Howell, assistant to Mr. Arpino, "Confetti," choreography by Gerald Arpino, music by Giacchino Rossini, [overture to Semiramide], lighting by Jennifer Tipton, conducted by Seymour Lipkin.