Paul and Storm – who used to be half of Da Vinci’s Notebook, and were awesome when I saw them in concert with Jonathan Coulton a few months ago – have a Thing. A Running Joke. They create themetunes for things as if they were written by Randy Newman. The joke is that they sound the same. Then the joke became that you could do this for a great deal of things without changing much. Then it became, as they put it, an exercise in musical haiku.
For Advent, they did one a day.
This is the one for Serenity (Contains spoilers)