I am very surprised to see so many people rate this 4 and less... After having heard this album for the first time in 20 years, I am absolutely amazed at the quality of these performances, from a musical point of view, forgetting for the moment the entertainment value of these concerts (who can deny that seeing Led Zep live in their prime was as close to seeing the face of God as a 15-year old can get to?). These recordings feature some of the finest improvizations, vocal and instrumental, that are available by this great band, and showcase their mastery. While faithful to the studio versions, the live songs bring out a different kind of glow and energy. To top it off, the sound quality is excellent for that period, they must have spent a fortune on recording equipment, and it shows.