In 1968 Hubert Humphrey had an election rally. Tommy James and the Shondells sang "Crimson and Clover". But since it was a political event, it had limited appeal and discouraged other points of view. As a result, it branded 1960s pop music generally. And in less than 3 years, there was no more 1960s pop music, except in recorded form. Chillingly, nobody has made 1960s pop music since (with the possible exception of Smash Mouth).

I think we should all take heed.