Messiaen's music was by this time championed by, among others, Pierre Boulez, who programmed first performances at his Domaine musical concerts and the Donaueschingen festival. Works performed included "Réveil des oiseaux", "Chronochromie" (commissioned for the 1960 festival) and "Couleurs de la cité céleste". The latter piece was the result of a commission for a composition for three trombones and three xylophones; Messiaen added to this more brass, wind, percussion and piano, and specified a xylophone, xylorimba and marimba rather than three xylophones. Another work of this period, "Et exspecto resurrectionem mortuorum", was commissioned as a commemoration of the dead of the two World Wars and was performed first semi-privately in the Sainte-Chapelle, then publicly in Chartres Cathedral with Charles de Gaulle in the audience.