 He also played with Arturo Benedetti Michelangeli, Isaac Stern, Henryk Szeryng, Jean-Pierre Rampal, Mstislav Rostropovich, Galina Vishnevskaya, Aldo Ciccolini, Paul Badura-Skoda, and Pierre Barbizet.Wallez studied conducting with Pierre Dervaux and then with Sergiu Celibidache.He was the artistic director of the Festival de Musique d'Albi from its creation in 1974 to its end in 1990.