He was a member of The Kenny Clarke-Francy Boland Big Band.
His first instrument was xylophone, which he played in a circus in the 1930s.
During World War II, he works as semi-professional, then becomes professional. After the war, he makes many European tours for the U.S. army.
Sadi won the Belgian Golden Django for best French-speaking artist in 1996.
In 1969 he has his own show on Belgian T.V., which lasted to 1974, as musician and singer, mc, arranger, bandleader and also in charge of the screenplay.