I agree that this chapter was excellent. My only comments are on what different possibilities might have yielded.
First, I'm not sure that the song helped much. Perhaps you should have tried the chapter with and without it and decided based on that.
Second, shifting the view to Daedalus did slightly weaken the emotion. Although it still kept the sad tone, perhaps this might have been another thing to experiment with to see if it was needed or not in the chapter.
Experimenting with writing can take a lot of time, but it's always good to play with possibilities in the search for the best one. As the chapter is, it was great, and that's why the only things I have to critique are only possibilities of what the chapter could have been like. Keep up the good writing.