It was 40 years ago today. Ah, you knew the story would start like that. What other way to begin? June 1, 1967. That's when "Sgt. Pepper's Lonely Hearts Club Band" hit the streets in the United Kingdom, a day later in the United States, and hit the consciousness of the pop world like a dose of something strange in the Kool-Aid. It was the eighth (British) Beatles album but also the beginning of a new chapter for the band and for a popular culture entering into the Summer of Love and a period of heightened experimentation with music, fashion,...