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I was reading this: http://www.dailymail.co.uk/sciencetech/article-2703107/Now-THATS-string-theory-Physicist-reveals-science-make-better-guitar-player.html and was wondering about guitar strings with variable thickness along its length. Could you have interesting harmonics with a well designed string. Would you get a nice sound or just a dull metallic twang with no sustain? Plus also, can someone kindly tell me what mu naught stands for in the equation on the aforementioned webpage.