Perhaps there’s no better way of demonstrating the difference between John Lennon and Paul McCartney than by comparing their respective holiday songs. While Lennon’s “Happy Xmas (War Is Over)” is a call for individuals to work toward peace in their everyday lives and for countries around the world to put down their arms, McCartney’s “Wonderful Christmastime” is about how the holiday party is “on.” One of the most annoying things about “Wonderful Christmastime” is how dated this 1979 synthesizer-based tune sounds. (The single’s cover art of McCartney in a red-and-white Christmas hat doesn’t help matters.) However, the finest melodymaker in pop music did succeed in writing an unforgettable hook. Which is precisely the problem.