The Ballad of the Last Chance Saloon

The Ballad of the Last Chance Saloon is an original song composed for the 1966 serial, The Gunfighters. Performed by Lynda Baron, the song provided "Greek chorus"-like narration for the story (it doesn't appear to have been heard by the characters, therefore its existence "in-universe" is unclear). Baron much later appeared as Captain Wrack in the 1983 serial, Enlightenment. There would not be another original song commissioned for Doctor Who until "Song for Ten" in 2005's The Christmas Invasion.