IO ECHO CONTRIBUTES MUSIC TO SWATH
Ioanna Gika and Leopold Ross (Liberty's brother) are Io Echo. They are a LA based band who have opened for Florence And The Machine, La Roux and for Nine Inch Nails' last show ever.
Not only have they written original songs for the movie, they are responsible for the dialogue for the Comic-Con Teaser.
You can check out some of their videos here and look to @ioecho and their tumblr for more info.