“Non, rien de rien Non, je ne regrette rien” Those lines to Edith Piaf’s 1960 hit song—”No, nothing at all/No, I regret nothing”—became her trademark. Many other musicians later offered their own renditions of “Non, Je Ne Regrette Rien,” and the song has appeared in many movies and commercials. But here’s the quandary: Can anyone…