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veloped into the musical scale we know today. Another example is from the famous poser, Bach. When we listen to his music in “。WellTempered Clavier”。, we find the notes are always getting higher .But amazingly, in the end, it es back to the initial height. Why is it? Thatamp。39。s why Bach was great! Itamp。39。s a very interesting maths problem. We call it a paradox. These days we learn maths at school. The only purpose is to get a high mark. But I personally think that