Id say music like all art is an experession of emotion, and human beings experience the full range of emotions, in all countries of the world, so all music can be world music if it wants to be.
Music and art can even express unallowed or repressed emotion. It is hardly surprising that Germany where open expression of anger is frowned upon and all aspects of life are overly organised and legislated, is considered by many as the home of heavy metal, because so much anger and frustration is expressed with heavy metal. We can express and/or release our anger and frustration by cranking up our heavy metal here, until we are calmly asked to turn it down, in accordance with noise law number something or other.
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