Sorry for the delay, but I don't have much time to hang around.
Science is born from the fact that concrete methods of conducting it exist. If you try to publish your research in a scientific journal, it has to fulfill some requirements, even if your're the brightest mind in the neighbourhood. Hearth wisdom is born from somebody finding (or believing) that something works (even though the reason behind the improvement may be a random variable) and the deduction that if something works now, it will work tomorrow as well.
It's the same with music. Some guy picks up a guitar (or whatever), plays something that sounds good (to him) and that's it. Positive reinforcement sometimes creates horrid results.
As far as the 'cultural differentiations' are concerned, there's a definite limit to what you can do with traditional music. You've listened to a couple of things, you've listened to them all. 'Rumination' is the keyword.
I cooperate routinely with professional musicians. I don't have the time to sit with them and sing the tune for a few hours, until they are ready to go record. I gotta give them the sheet music and I want them ready for the studio afterwards, spending time on interpretation issues instead.
Using the suit metaphor, the suit is not an indicator, but at least the presence of clothes is.