Actually, I originally had the June 10th, 1975 Memphis performance picked so the voices would match better, but the pace of American Trilogy was sped up VERY much then... so I had to go with an earlier one... that particular 72 performance just happened to be the one I first picked up, and I thought it matched fairly well with the other one.
I could have used an official version, but the stereo/mono differences would have ruined the feel and made the splices stand out like a sore thumb.
Wouldn't it be cool to have "America, The Beautiful" in Stereo!! I can dream, anyway.... lol
Happy 4th of July!