I'm not sure about that. Zep looted a lot of blues songs and just made 'em harder, and "hard rock" was a thing by that time. I was a huge fan and they were my

I'm not sure about that. Zep looted a lot of blues songs and just made 'em harder, and "hard rock" was a thing by that time. I was a huge fan and they were my first "real" concert in 1977, at the infamous Day on the Green where Bonham and Grant were arrested for beating up a BGP employee. Get off my lawn! :-)