Ok, I know I posted a thread on here a couple of weeks ago about what song I think they should have played in the "Sacrifice Chloe" ending, but I just realized I was wrong, very wrong, indeed. Here, play this link while watching the "Sacrifice Chloe" ending with the sound down and tell me they don't sync up perfectly. Start the song at about when the butterfly flies out the window. This is seriously moving.

Neil Young - Ambulance Blues

And here's a good example of that ending: