This 1971 Christmas song plays while Lorelai and Rory make up their fight at the vending machine.
With lyrics by John Lennon and Yoko Ono, set to the tune of the traditional English English ballad Skewball, Happy Xmas (War is Over) was released as a single by John & Yoko/Plastic Ono Band with The Harlem Community Choir. Also a protest song against the Vietnam War, it has become a Christmas standard which has charted several times in the UK, and been re-recorded many times.
The song signals that the conflict between Lorelai and Rory has come to an end, and that a happy Christmas is coming now that their war is over.
The Annotated Gilmore Girls 