Many piano manufacturers recommend that pianos be tuned twice a year.Īn illustration of beating. Professional training and certification is available from organizations or guilds, such as the Piano Technicians Guild. Piano tuning is done by a wide range of independent piano technicians, piano rebuilders, piano-store technical personnel, and hobbyists.
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In practice, a MIDI software can label middle C as C 3-C 5, which can cause confusion, especially for beginners. Note that for a classical piano and musical theory, the middle C is usually labelled as C 4 (as in scientific pitch notation) However, in the MIDI standard definition this middle C (261.626 Hz) is labelled C 3. In all systems of tuning, every pitch may be derived from its relationship to a chosen fixed pitch, which is usually A440 (440 Hz), the note A above middle C. (See Piano key frequencies for the theoretical piano tuning.)
Pianos are usually tuned to a modified version of the system called equal temperament. Fine piano tuning requires an assessment of the vibration interaction among notes, which is different for every piano, thus in practice requiring slightly different pitches from any theoretical standard.
The meaning of the term 'in tune', in the context of piano tuning, is not simply a particular fixed set of pitches. Piano tuning is the act of adjusting the tension of the strings of an acoustic piano so that the musical intervals between strings are in tune.
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