In preparation for Christmas and the premiere of this year's remaining Doctor Who specials, the BBC's official Doctor Who website launched their online advent calendar for 2009 last Tuesday. The advent calendar will feature many exclusive treats over the next thirteen days and door number twelve on the calendar is now available to open due to the fact that today is the twelfth of December. Behind today's door, there's some previously unreleased music from The Next Doctor and in total, it has an approximate running time of forty nine seconds. You can listen to this incidental music piece here and content from behind the calendar's previous doors can be found here. This year's thirteenth door on the calendar will be available to open tomorrow afternoon and details regarding the next advent treat will be posted on this site soon. What do you think of this musical score?