We're adding the 449th and 450th songs to our list, and that means it's MILESTONE TIME, BABY! Ian tries to find the greatest holiday song of all time and submits a familiar tune by a legendary artist that contains surprises and multitudes. RJ looks for the worst holiday song of all time and lands on a parody of "Let It Snow" that manages to both be both vulgar and prudish - and it ain't exactly easy on the ears, either.