One song that takes me right into the scene is "White Rabbit" by Collide. I can't hear it without being right in 402 with Emmett in the field, where he is tripping on 'shrooms.
I love this scene partially because of the awesome filming effects they used to make us be able to see what Emmett was feeling but also because it is where Emmett finally starts to rekindle his flame and recover from how Ted crushed him.