James McCartney and Sean Lennon have written a song together, the sons of the most famous songwriting team in history. James describes a romance that began on the hill in Regent's Park that gave the London borough its name.

The song, of course, reminds us of the great deeds of the fathers, especially the nostalgic "Penny Lane," which in turn referenced landmarks in Liverpool, the Beatles' hometown. It's not from the Beatles John Lennon and Paul McCartney, but from their sons Sean and James. It feels like we're not only getting the ball rolling, says James McCartney on his Instagram account. Do Lennon and McCartney not only have a past but also a future? That would be a blast though. Because "Primrose Hill" is really pretty, and it's really fitting - of Leonard Cohen's calm tenor voice begins, it's not that similar to Papa Paul's.