Ah, the holidays approach once more, and with them, as always, comes the relentless and merciless assault on our collective eardrums known as Christmas music. Replete with sleigh bells and whip-cracks and some of the most vapid and useless lyrics ever written, the songs of the season stand as the most reasonable justification for a "War on Christmas" imaginable, if only said war wasn't entirely imaginary.And in a genre overflowing with terrible songs, "Little Drummer Boy" is surely one of the worst offenders.…