Fleetwood Mac's 1976 single "Rhiannon" was the group's first huge radio hit with the Nicks/Buckingham lineup. Stevie wrote the song months after reading the novel Triad by Mary Leader. It's about a woman possessed by someone named Rhiannon, which is also the name of a Welsh witch. Her vocal performance on the song is a tour-de-force, and it only grew more powerful as the years went by. The song become so huge that many people began to associate Nicks with actual witchcraft. She has sung the song at pretty much every concert she's done over the past four decades, but still manages to make it sound fresh each time.