Piano tuning guide Tuning is the process of adjusting the pitch of one or many tones from musical instruments to establish typical intervals between these tones. The effect or the purpose of piano tuning. In fact, not only includes such an action of the pitch adjustment, but also in order to eliminate almost unnecessary "internal stress" of all stressed members to the piano, and enables each components to adapt to the force to be borne as soon as possible, and let the force more balanced. Tuning a piano is usually based on a fixed reference, such as A = 440 Hz. Out of tune refers to a pitch/tone that is either too high (sharp) or too low (flat) in relation to a given reference pitch. While an instrument might be in tune relative to its own range of notes, it may not be considered 'in tune' if it does not match A = 440 Hz (or whatever reference pitch one might be using). Some instruments become 'out of tune' with damage or time and must be readjusted or rep...