The Royal Opera House, Covent Garden, Ltd., general administrator: David L. Webster, in association with the Arts Council of Great Britain presents The Royal Ballet (formerly The Sadler's Wells Ballet), from the Royal Opera House, London, under the management of S. Hurok, director: Ninette de Valois, associate director and principal choreographer: Frederick Ashton, musical director: Hugo Rignold, musical adviser: Robert Irving, associate conductr: Kenneth Alwyn, choreographers to The Royal Ballet: John Cranko, Kenneth Macmillan, ballet master: John Hart, guest conductor: Arthur Lief, presented in Washington by Patrick Hayes, II. "La Peri," poeme danse, music by Paul Dukas, choreography by Frederick Ashton, scenery and costumes by Andre Levasseur, conductor: Hugo Rignold.