I agree as usual with everything Nutrocker says, I would just like to add that not only does the quality of the recording depend on the quality of the recording equipment used as well as good seats to record from, but also the natural accoustics of the venue the concert takes place in. A lot of the venues were really buildings designed for sporting events, etc and not for musical accoustics. When Zep's live audience got to the size that venues like sports arenas had to used to hold all the fans I would wager that if these buildings had been designed with acoustics in mind we would have many more nice sounding boots to listen to. I have heard people say I saw these guys or those guys live back in the day and the concert sounded terrible, they sucked. I always have wondered did the band really suck or were they really putting on a good show and it was just bad accoustics giving the illusion that they sucked.