The soundboard will expand and contract with seasonal changes in temperature and humidity and the string tension will fluctuate accordingly. The pianos soundboard, upon which the strings are attached via the bridge, is 3/8" spruce wood. Extreme changes in humidity levels, as occur in the North East, can drastically affect tuning stability. Variations in the relative humidity is generally the most important criteria in determining how often a piano needs to be tuned. However, there are several factors that may necessitate more frequent tuning the environment, the mechanical condition of the piano, frequency of use and performance requirements. The recommended minimum for a household piano getting moderate use is tuning once a year.
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