I got this nice app, LastHistory, it analyze music listening histories from Last.fm through an interactive (dot) visualization.

But this app still lack of numerical data. From the picture above, I can say that I’m really a night owl. Most of my library is rock (pink), I like post-rock.

The other music analyzer is iTunes genius. It’s pretty neat. Picture below show us Genius Mixes, that categorize music library based on genre. You can make playlist based on one song too.