Happy Bithday to John Lennon! He would have been 72 today. Listen to the Fab 4 at 4 for a couple from John Lennon!

The attendees of John's 31st Birthday Party sing "Happy Birthday":

John tries to explain to Sean about how birthdays work and later explains the Sun:

Rare footage from John's 31st Birthday Party on October 9th, 1971 in a hotel room in Syracuse, New York with Ringo and Maureen Starr, Yoko Ono, Jim Keltner, Allan Ginsburg, Phil Spector, Klaus Voorman, and others:

Janis Joplin and the Full Tilt Boogie Band dedicate "Happy Trails" to John Lennon, circua 1970:

Aerosmith's 70th Birthday Tribute to John Lennon: