From the movie soundtrack. Lengthy, compelling & ominous.
It's Halloween. Gotta represent for the Wicked Witches.
String quartet style.
Well, because there's the word "bat" in the title. And because it is clearly the theme to a Tim Burton movie, which automatically makes it Halloween music, I think.
Because what's scarier than Darth Vader?*
*Question invalid if you've seen the last 15 minutes or so of Revenge of the Sith.