If this kind of thing interests you, I made an app that graphs last.fm song listens in the same way as Wolfram's graphed his emails.
I find changes in listening habits correlate well with big life changes.
I find changes in listening habits correlate well with big life changes.
It takes quite a while to fetch all plays if you have a lot, and currently, if you want to share the graph with your friends, they would have to wait too.