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Much of a piano is made of wood and is therefore extremely sensitive to fluctuations in humidity. The piano's wooden soundboard is designed to have an arch, or crown. The crown increases or decreases with changes of humidity, changing the tension on the strings and throwing the instrument out of tune.
A man tuning an upright piano. Piano tuning is the process of adjusting the tension of the strings of an acoustic piano so that the musical intervals between strings are in tune. The meaning of the term 'in tune', in the context of piano tuning, is not simply a particular fixed set of pitches. Fine piano tuning requires an assessment of the ...
This is the most common tuning system used in Western music, and is the standard system used as a basis for tuning a piano. Since this scale divides an octave into twelve equal-ratio steps and an octave has a frequency ratio of two, the frequency ratio between adjacent notes is then the twelfth root of two, 2 1/12 ≋ 1.05946309... .
A humidistat or hygrostat is an electronic device analogous to a thermostat but which responds to relative humidity, not temperature. A typical humidistat is usually included with portable humidifiers or dehumidifiers. It can also be included with combined air cleaner or humidifier units to control a home's humidity level or any other indoor ...
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For example, while many pipe organs require tuning or other maintenance more than once a year, the Marcussen pipe organ on the campus of Wichita State University in Kansas is carefully kept at 72 degrees Fahrenheit and 50% humidity year round and requires tuning and maintenance only once every four years. Its Danish caretakers credit meticulous ...