You know, not counting a few oddities, I think one can really tell a person's current state by the music they like listening to. I guess one could call music an emotional barometer of sorts. Not that this is a terribly surprising idea, more like we just don't think about it much. If you ever see someone go through some major event/change in their life, very often their taste in music can change. My brother, for instance, used to listen to mostly the harder rock type stuff, and his bands became even harder after he had been in the marines a while. Interestingly enough, after he started rock climbing a lot, he mellowed out a little bit and has started listening more to the likes of Phish and Dave Matthews. I've noticed that the songs I listen to are often affected by mood. I don't tend to like the harder rock stuff unless I'm angry or in a head-banging mood. Likewise, I have to be in a calmer mood, or want to be, to listen to classical music and some of the really mellow stuff. Also intriguing is how the music can start to mold our moods and views of things, though this is true of most things. Anything done repetitively starts effecting the brain and perceptions.