Everything about this chapter is great again. It makes such fantastic use of non-linear storytelling again; the way Asa chats with her friends and then instead of the manga being explain-y just showing us these moments, and then of course as Nightflier above said even beyond that everything just ties together; they are talking about a thread through the lyrics, and echoes, and that's that thread through the chapter, which helps her find those lyrics, and so on ...
It's not even anything too outrageous, but it just feels like other manga don't get anywhere near this sort of thing.