20. "London Bye Ta Ta"
This Kinks-inspired tune was originally slated to be Bowie's follow-up to "Space Oddity," but Bowie pressed hard to release "The Prettiest Star" instead, which was a monumental failure. It's hard to imagine "London Bye Ta Ta" being any sort of a big hit, but it's a significantly better song that deserved a release on a legit album. Check it out on the deluxe version of the 1969 self-titled disc or the BBC sessions.