Mysterious Skin

The song that appears mid way throught the trailer may be "Goodbye to Wendy", the 8th song on the soundtrack, but I'm not totally sure. Afterall, the music in the film appears to be exclusivley composition work. Additionally, the song that appears halfway throught the trailer clearly sounds like composition work that is featured on the soundtrack.
I can't for the LIFE OF ME figure out what that last song in the trailer is. It's not off of the score, I have it and know it well. What I can tell you is that it sounds like a slowed down instrumental verson of Cocteau Twin's "Sugar Hiccup". Who knows, I might be far fetched with that theory?

It def sounds exactly like a Cocteau Twins melody though, so it could very well be by Robin Guthrie.