Nitrous Oxide

Not a whole lot of dinner happening around here lately. There would have been one yesterday had I not gone in for a root canal. Nasty procedure, I assume, though I was too high on nitrous at the time to be able to say for sure. I had many drug-induced insights, but here's the one that stays with me: the four-chord sequence that underlies "Billie Jean" is the same one that structures "Moondance!" How did I never hear that before?