Excellent list. I can hear each song without playing the embedded videos. Three comments:
1. "don’t need religion to have a religious experience"...amen sister
2. "Bring it on Home" is the highlight (for me) on the best Zep album side
3. And as great as the mighty Zep are, my vote for the originators of heavy metal goes to Black Sabbath. Maybe Zep's debut album came out first, but that's a blues rock album in my view.
All in all the Zep playlist is a beast.