Last year, we got the release of “Now And Then,” which was promoted as the final single from the Beatles. The song is the fleshed-out, AI-enhanced demo of a track that John Lennon recorded in 1979, and Lennon is the sole credited songwriter. It didn’t seem like we’d get anything else from the fabled Lennon/McCartney team, but we’ve got one today. It’s just that this new song doesn’t come from John Lennon and Paul McCartney. Instead, it comes from their sons.