Forty-five years ago, the band played before 45,000 screaming fans in Chavez Ravine. It lasted a half-hour, it was the next-to-last concert they ever played — but those who were there recall it vividly.Remember who was playing second base for the Dodgers 45 years ago Sunday? If you said John Lennon, you're close. All the Beatles played the infield that night, on a stage set up at second base, draped in blue and white, of course.