On November 11, 1945, Gisèle Peyron and Mady Sauvageot, sopranos, Lili Fabrègue, viola, Yvette Grimaud, Yvonne Loriod, Pierre Boulez and Serge Nigg, pianos gave a concert of works of Wyschnegradsky. Contracting tuberculosis, he rested at the sanatorium of St. Martin-du-Tertre. In 1947, André Souris gave the première in Belgium of the "Symphony Thus Spoke Zarathustra" for four pianos in Brussels. In 1951, Pierre Boulez, Yvette Grimaud, Claude Helffer and Ina Marika gave a performance of the "Second Symphonic Fragment", opus 24 in Paris. The Revue Musicale published a special issue on Ivan Wyschnegradsky and Nicolas Obouhow.