The quote about underestimating the American public is attributed to H.L. Mencken.

Sorry clare s. I can't help you, I was only two and a half years old when the Beatles hit the Ed Sullivan show. I know my parents liked their music, I grew up with most of their albums ringing in my ears. In 1977 we were camping near Naples Italy. My older brother had a guitar and there was a bus load of single adults from New Zealand, Canada, and Britain also in the camp site. We got together for a sing around. The only songs that people could sing that we all knew were Beatle's tunes and Christmas carols. I don';t know if that helps but it is a surreal memory for me.

Sophocleese