Yes - great post. But there was also great work 48 years ago, at the 1969 Toronto Rock and Rock Revival.  12 hours, featuring Stepenwolf, Little Richard, the Doors, Alice Cooper, John Lennon with Yoko Ono, others, and Chuck Berry. Chuck was great. He played My Ding-al-ling and did it as a sing along. "Now just the boys", and then "Now just the girls." There was quite a titter running through the crowd at that:)