Shortly before she and Buckingham joined Fleetwood Mac, Nicks picked up a novel called Triad at an airport. The book told the story of a Welsh woman who believes she's been possessed by another woman, named Rhiannon. "I wrote this song and made her into what I thought was an old Welsh witch," Nicks said. "It's just about a very mystical woman that finds it very, very hard to be tied down in any kind of way." Envisioning a "Welsh country song," Nicks began with stark, autumnal piano chords, around which Buckingham built a guitar part. "My tendency is to want to add rhythm and to rock it up," he recalled. Nicks later learned that Rhiannon was a character from Welsh mythology, but the real myth she invented on Fleetwood Mac's first American Top 10 hit was her own – the shawl-wearing California enchantress who left crowds stunned by her smoldering, trancelike performances. "She's like your fairy-princess godmother," Courtney Love once said, "who lives in a magical kingdom somewhere and has, like, fabulous romances."