[Tutor] "Analyzing" music with Python

[Timo]

I'm sorry if I don't use correct names etc.. What I want is to analyze a 
music file that is playing. Not sure if analyze is the good word for it. 
I just want to get info about the song in realtime when it is playing. 
Info about the current pitch and so.
Let's say like most visualisation plugins in music players. The 
visualisations move on the music. I don't want to write such a plugin, 
but I want to get info to do something similar.

Damn, hope this makes sense.

Thanks