Very nice 70's...often Keith scoffed at Led Zep...but i think that goes back to Yardbirds times. Robert Stigwood reneged on a payment to the Stones..they never forgot!
It was logical to bring in Keith Harwood at the end of these sessions- given the connections. Stones and Zep's paths crossed quite often...especially studio wise.
I saw Led Zeppelin on the last 1979 tour...but mainly to see The New Barbarians as support, featuring Keith, Ron, Stanley Clarke and Bobby Keyes.