The reason that one might argue that Feist presents a case of a "third term," as per Barthes, is that she exhibits a moment of destruction in her career, in the form of personal injury. During her time with the punk band Placebo in the 1990s, she began to bleed from her throat due to the high volume and frequency of forced singing during a tour. This forced her to embark on a full year of therapy and recuperation (no pun intended).
It can be argued that this destruction and recuperation resulted in Feist no longer worrying about singing well, that is, with precision. This is part of her notion of "jhai," a label that should not be given too much weight, but one which was apparently marketed in relation to her album "Let it Die." "Jhai" also carries with it a suggestion of relaxed singing, without much worry or stress. More about "jhai" later.