It's an alternate version [the begining is the end is the begining] of the Batman 3 theme by Smashing Pumpkins [the end is the begining is the end]. Although i can't be sure that this one wasn't also in the film. I finally saw the trailer and it looks interesting. I felt the tune suited the visuals...

Is it worth trying to get up to speed on Watchmen at this point or should I wait and watch the film with an open mind? I'm not asking whether people think the movie is faithful to the story so much as getting in on a [somewhat] ground floor without any preconceptions.