I should have said a time-waster instead of useless. (unless you have
a limited set of files) Can you give a list of different
characteristics that you use for classification ?
I'd have to say I disagree with this, but basically, I think this is because we're looking for different things.
I want to be able to lauch PyTone and have it choose a playlist that I won't have to tweak to any great degree, if at all. For an algorythm to be able to do this, it needs to have intelligent, correct attributes about it's library.
Given that two humans rating & scoring music going into the library will likely score subjective characteristics differently, I really doubt a computer system would be effective at this for things other than tempo and maybe instrumental/voice. My larger concern would be false ratings which would cause problems for the playlist engine.