 He dubbed the singing voice of Alain Cuny in "Les Visiteurs du Soir" (1942).He was for five years professor at the Conservatoire in Marseille, then held a similar post at the Paris Conservatoire, finally teaching vocal technique at the Opéra-Studio.Besides the three recordings of "Pelléas et Mélisande", Jansen's discography includes Frédéric in a complete "Lakmé".