In 1967 Vallée represented Belgium in the Festival of Rio where Jacques Brel was a member of the jury.
In 1980, Robert Hossein asked him to interpret the role of Javert in the Broadway musical "Les Misérables". Five hundred thousand spectators applauded this adaptation sung the work of Victor Hugo.
Jean Vallée was made Knight of the order of the Crown by his Majesty Albert II in 1999.
In 2008, he presented a show in tribute to his elder compatriot Jacques Brel.
Nana Mouskouri performed in 1971 a song written by Jean Vallée,' The Wave', which became one of his biggest hits.
According to the report of his death, Jean died of Cancer in Belgium. He had returned from Paris to his home country in his last days to die.
He represented Belgium for the Eurovision Song Contest 1970 with "Viens l'oublier" finishing eighth. He participated a second time in the Eurovision Song Contest 1978 with "L'amour ça fait chanter la vie", ending up second behind the Israeli entry.