Boing boing published a picture of pythons to celebrate the upcoming Year of the Snake which reminded me of this.
It still sounds good after all these years. I was surprised to find that Rod Stewart was the only currently-famous person on it. For some reason I'd convinced myself that either Jeff Beck or one of the famous bass players of the period was on it, but according to Wikipedia, it was just the band + Rod the Mod. It was recorded by John Peel and went unreleased until 1970 though I don't remember hearing until '72, when it was re-released and became a temporary favorite.