Diogenes and Alexander (La rencontre d'Alexandre et de Diogène de Sinope), a Puget bas relief
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La rencontre, an 1854 painting by Gustave Courbet nicknamed "Bonjour, Monsieur Courbet"
The first of the pieces to be officially premiered was Es, performed in Brussels on 15 December 1968 on a concert of the Rencontre de Musique Contemporaine, by the Stockhausen Group, joined by Michel Portal, Jean-Pierre Drouet, and Jean-François Jenny-Clark.