 His last performance was in Tours in March 1971.Although best remembered for the role of Pelléas he also sang baroque opera ("Les Indes galantes" and "Platée" by Jean-Philippe Rameau), modern opera ("Christophe Colomb" by Darius Milhaud and "Les caprices de Marianne" at the Théâtre des Champs-Élysées in 1956), operetta ("The Merry Widow" by Franz Lehár, the premiere of "La Belle de Paris" by Georges Van Parys in 1961 and Antonin in "Ciboulette" in Geneva) and mélodies.Jansen was a magnetic interpreter of Danilo in "The Merry Widow", which he performed some 1,500 times in France, displaying his acting skills, which he also used in several films.