Paul McCartney will perform part of a never-recorded Beatles song for an upcoming documentary on John Lennon.
The two-part special, John Lennon at 80, is hosted by Sean Lennon to commemorate his father's 80th birthday.
McCartney plays a bit of a song called "Just Fun", the first song he ever wrote with Lennon, back in 1957. He says "Eventually, we started to write slightly better songs".
John Lennon at 80 will air October 3rd and 4th on BBC Radio 2.