When is it best to have it granted? There is not a period more favorable than another! If the instrument is used by a professional four hours a day, an agreement will be required three to four times a year, as part of a study or implementation use, lighting your heating in the fall. The second annual agreement can be made in the spring. Even if nobody uses the piano right now, it naturally disagrees. It may be that the interest of a friend or family member is revived. Call me for an appointment! more... See more text