Insane," or in French, "un truc de malade": expressions often used to describe a strange work of art, a daring piece of architecture, or an experimental piece of music. It’s a comment that should be taken figuratively: not necessarily pejorative, and most often even positive. In contrast, the music of this album reflects a "sick" theme in the true sense of the word, as the two protagonists chose to resume their twenty-year collaboration in the antechamber of a hematologist's office.

The album’s title should be understood in this sense: "rare people," not necessarily in their behavior, but rather in an exceptionally grim period of their lives. The music on this album is sometimes harsh, sometimes tender, but always filled with energy, despite the treatment it has undergone. Temporarily dubbed “Instant Songs,” the compositions were created and recorded in the moment, subject to free improvisation, leaving no chance for smoothing or refinement—resulting in rare music.