What is the music that is playing throughout the entirety of the Teaser to 500 Days of Summer which can be found here:
http://www.youtube.com/watch?v=S61-mwjgLU4
http://www.foxsearchlight.com/500daysofsummer/
http://www.youtube.com/watch?v=S61-mwjgLU4
http://www.foxsearchlight.com/500daysofsummer/