Listen to Il faut savoir online. Il faut savoir is a French language song and is sung by Charles Aznavour. Il faut savoir, from the album Les géants de la chanson - Brel-Brassens-Aznavour-Bécaud-Etc. (Remasterisé), was released in the year 2015. The duration of the song is 3:11. Download French songs online from JioSaavn.