Chris Willman Senior Music Writer and Chief Music Critic Was there anyone who didn’t have an opinion — and the strong need to express it — when the Beatles‘ “last single,” “Now and Then,” came out earlier this month? The surviving members’ long-aborning completion of a 1970s John Lennon demo profoundly moved millions of fans, and put off some others, but no one in practically any demographic — not boomers or even Gen-Z-ers and millennials — wanted to hold their tongue about it. And that’s the kind of marketing that money and promotion can’t buy.