Relatively small number of manufactories recommend four tunings a year. Twice is more common. However, what you described does not sound right. If your son is beginning or even intermediate student, who should not be able to tell if the piano is out of tune after just three months under normal situation. Check the following, if your situation matches one or more of them, it may be the reason.
1. The piano was delivered "right out of the box";
2. The piano was tuned immediately or almost immediately after the delivery;
3. The piano is placed somewhere where temperature and humidity change dramatically, ex. near a window where the sun light sheds on the piano;
4. There are elderlies who love to open the windows even during the rain;
Next two are less likely, but possible.
5. The piano is a lemon;
6. Your child's talent matches that of Mozart, who could tell subtle changes in pitch.
1. The piano was delivered "right out of the box";
2. The piano was tuned immediately or almost immediately after the delivery;
3. The piano is placed somewhere where temperature and humidity change dramatically, ex. near a window where the sun light sheds on the piano;
4. There are elderlies who love to open the windows even during the rain;
Next two are less likely, but possible.
5. The piano is a lemon;
6. Your child's talent matches that of Mozart, who could tell subtle changes in pitch.
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