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While I've browsed Google, Yahoo, Bing and Wikipedia, I can not find an answer about why. I've examined those sites of Taylor, Martin, Gibson, Fender and even more manufacturers and they also definitely don't discuss it. I can not even find anybody with a guitar online forum that has speculated about why. You can always discover new facts, methods and techniques, that helps you overcome such problems. The fact that nowadays, most people suffer stress is sufficient to allow you to no less than think of going through the reality within your life- suffering some problems of course, if you do, how can you are able to overcome them?