Tuning
Tuning is the adjustment of the musical interval between keys, by adjusting the tensions of the strings struck by them. Pianos go out of tune with time, use, and unstable humidity and temperature.
Because no two schools are the same, there’s no single recommended number of times to have your school’s pianos tuned, but as a guide, we recommend that home pianos be tuned twice per year, ideally in Autumn and Spring.