When you think about the sheer number of strings in a piano - multiples per key, remember - and the tension to which they are stretched, you realize that there must be a colossal amount of force trying to break the piano in two. This explains the need for such heavy construction - a frame of cast iron is needed just to resist the tension of the strings. It also explains why a professional piano tuner can be an important person to call if you need piano tuning.
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