Authenticity in the music industry is slippery when wet. Everyone praises its value, yet when an artist is truly authentic, it is often only embraced if it can be easily walked on without slipping and landing in a pile of genre-related questions. To the casual observer, Freddy & Francine seem safely cemented as a folk duo. They got the look. The soulful harmonies. The folk circuit bookings — over 150 a year, including the legendary Telluride Bluegrass Festival. Even their act’s name is cute. You could make a movie about it. Someone probably has.