I think most of us have thought about this at some point in our lives, egocentric as we all can be
I'm no different, I used to wallow in that kinda stuff when I was feeling bitter and pitying myself etc. Nowadays I'm a pretty chipper guy so it's not as important as it used to be but I just thought about it and it would be fun to see other people's choices.
I just realized that it's really hard to find a Floyd piece that would fit - I mean they all sound pretty bitter and resentful and so on. Maybe Shine on, but then the average Joe would probably fall asleep during the intro. Echoes? Maybe so.
Actually, Street Spirit (fade out) /Radiohead would be my choice. What a perfect last message "Immerse your soul in love" from me to the world.
Cheers.