I first saw Zep at the Shepton Mallet Blues Rock Festival in 1970, what a great Bill that was. Reads like a hall of fame!
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Then Zep again in 1975, and more recently Page & Plant a couple of times.
They still rock!
I see Canned Heat on the bill. Did you see Canned Heat too? Alan Wilson died not long after this. I love the Alan Wilson era Canned Heat.