Here is his description:
I tried to make sense of the many demos that we have for these two songs. So I selected representative versions and arranged them in this video, which in two parts tells the story of how they were written.
I hope this helps to reduce some confusion about this fascinating process!
All the demo versions I used are available on "Between The Lines", which I shamelessly plug here. But don't ask me where to get it, please... and remember: never pay for the set if you see it anywhere. It's supposed to be spread for free.