E, from a PBS tie-in publication called "Fun With Folk Guitar". It wasn't, as I recall, but it steered me away from all songs with that 4-string F for years. Meanwhile, where did all those women go who played (or anyway held, uncomfortably) folk guitars while wearing (the women, not the guitars) elbow-length gloves and sporting sort-of-bouffant hair, on the covers of these instruction books? I was sort of expecting a different social set than the players I have met since.