 He continued his training in conducting during summer sessions, notably under Sergiu Celibidache in Siena, Italy, 1959–61, under Charles Munch in Tanglewood in the summer of 1962, under Jean Martinon in Düsseldorf in the summer of 1964, and under Hans Swarowsky in Vienna 1964–65.Hétu made his Canadian debut in 1963, conducting the Montreal Symphony Orchestra in a concert organized by the JMC.Claude Gingras described this debut in Montreal's La Presse (6 March 1963)