Stevie Nicks has once again opened the vault that is her decade-spanning career to give fans "Lady." Originally recorded with Fleetwood Mac bandmate Lindsey Buckingham as "Knockin' On Doors," (courtesy of Stereogum) the song is a simple piano ballad in the sort of stripped-down "Landslide" style that Fallon favorite Nicks does so well with her evocative voice. It's set to appear on Nicks' upcoming 24 Karat Gold–Songs From the Vault, an LP of previously recorded and unreleased material. Though it may be old, "Lady" feels like a pretty timeless love song. Stream Nicks' new track below and look out for 24 Karat Gold on October 7.