We assume it's traditional because it's a Christmas song, but regardless of the definition of traditional (whether "a song without a known author" or "a folk song"), it's hard to call a Tin Pan Alley song sung by a country music star "traditional" :)
Robert May wrote the story of "Rudolph the Red-Nosed Reindeer" in 1939 as a Christmas promotion for his employer, Montgomery Ward. Marks was his brother-in-law and made a song from the story ten years later.
LOVE that OK go was in there. Almost no one listens to them anymore. ;)
Dead Souls since souls are body parts as much as heads in the sense being used here (mind), Metal if you've undergone hip replacement surgery, and Big Man with a Gun if you're from Texas and consider your gun to be an appendage.