Jimmy Page: Certainly within the vehicle of Led Zeppelin there was so much improvisation that was employed within the framework of a number, and our sets went from — well, in those early days they were maybe an hour, hour and twenty minutes, to three hours, three-and-a-half hours, because we were jamming and we were making up music there and then on the spot, and — because the thing about the band was that you would have to be listening all the time to what everyone else was doing. So if I was to take a different shift, a different route on the guitar, they’d be with you like that, or if Robert was going to sort of sing — if you were going into a quiet passage and Robert would start singing something, you’d be straight with him on it with something that was new and you — new chord structures, and it was pretty — a pretty extraordinary thing.  So it was — there were frameworks to numbers, but there were whole areas for improvisation. So prior to going on the stage you’d have to be very focused so that you could really — especially if it was starting with something like Song Remains the Same, which is a pretty testy song, and yeah, you’d need to be very focused to go on and kick off with something like that, but as I may have mentioned before, you wouldn’t know what was going to happen within those three hours because so many things would come up. And you wouldn’t necessarily remember everything that had gone on either, so it was pretty good. There were so many bootlegs that I managed to listen to with all these different concerts because there were — some of them really dramatically different from night to night, to hear just exactly how marvelous we were.