Saw them in 1974 at the Spectrum in Philly.
I saw quite a few shows in the Spectrum in the 70s and 80s-The Dead, Dylan, Neil Young, Rush, The Who, BOC, The Outlaws,U2, AC/ DC, and many others.
I saw them in 1973 at Winterland in San Francisco.
A show for the ages.
For live bands, only the Stones, Lynyrd Skynyrd and Pike Floyd were comparable.