The first concert that I ever attended was a pink floyd 'concert'at  the electric factory (which at the time was a former tire factory),on market st. in Philly in the mid seventies, or somewhere around there. Having been almost knee to knee with Roger Waters for the duration of about two hours, I had been converted. I saw them almost every time they came to Philly, including the concert where the fans dispensed with fences and swarmed into the arena - but who could blame them?