If I may paraphrase John Lennon: Imagine there’s no Beatles. Richard Curtis, who made the greatest movie love letter to pop/rock and roll of all time, “Pirate Radio” as well as classics like “Four Weddings and a Funeral,” “Notting Hill,” and “Love Actually” has written a new film called “Yesterday,” directed by Danny Boyle (“Slumdog Millionaire,” “Millions”), about a world in which the Beatles never existed. When you look up “Beatles” online, all that comes up is the insect. Just one person remembers their songs, and when he plays them, everyone thinks he wrote them, which of course makes him wildly popular. I can imagine this will be a lot of fun. And I know the music will be great.