I presented my research to my research group today, and people seemed to follow along and had some good comments for me! (I'm particularly happy about the following along part because there's a lot of abstract math involved...)
Shine On You Crazy Diamond parts 6-9 feels kind of bittersweet to me. The album covers the arc of Pink Floyd's career; it starts with Shine On You Crazy Diamond parts 1-5. Parts 6-9 come at the end of the album, and while they are definitiely a contination of the same themes, they're also distinctly different from parts 1-5.
It feels bittersweet because change is unavoidable; you'll never be the same person you were last year, nor will your relationships with others remain constant. However, people and relationships can change without losing their defining essence, I think.
I'm not sure where I'm going with that, but thanks for listening to me ramble a bit.