To date no piano has ever been made by any piano manufacturer that does not require a schedule of regular tunings by a professional tuner. It is also a fact that a piano will go out of tune whether it is played or not. Local changes in humidity and changes in the seasons, affect all pianos, new and old, no matter if they are played or just left. All manufacturers recommend a piano is tuned twice a year Piano Tuners listed on this site who are full members are covered with a minimum of £5 million public liability insurance and £10 million employers insurance.