In 1970, Vashti Bunyan thought she was on the verge of becoming a star. She hit the pop charts a few years back with a song penned by Mick Jagger and Keith Richards. She poured her heart and soul into a debut album of folk music — but the album was a commercial and critical failure. Devastated, Vashti moved to the countryside and focused on raising her family. Meanwhile, a handful of influential folk singers in the U.S. were listening to her supposed flop — and over the next 30 years, Vashti’s music was taking a journey of its own.