In Welsh mythology, Rhiannon is a goddess associated with fertility, the moon, and horses. In the song, the narrator describes hearing the voice of Rhiannon calling out to her, drawing her into a mystical world of magic and wonder. The song's lyrics are filled with evocative imagery, including references to the moon, the night sky, and the goddess herself.
While the song is based on mythology, it also has a personal meaning for Nicks, who has described it as being about her own experiences with love and relationships. In interviews, Nicks has spoken about the song's themes of longing and desire, and how they reflect her own romantic experiences.
Overall, "Rhiannon" is a powerful and evocative song that blends mythology and personal experience to create a timeless classic of the rock genre. Its message of love, longing, and mystical wonder continues to resonate with listeners today, making it one of Fleetwood Mac's most enduring and beloved songs.