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The only way to tune a piano perfectly is to tune it precisely imperfectly, i.e. by equal temperament.
J. S. Bach championed the cause by demonstrating it practically, in his astonishing Well-Tempered Clavier, known as ‘The 48’.
The Well-Tempered Clavier, BWV 846–893, is a collection of two series of Preludes and Fugues in all 24 major and minor keys, composed for solo keyboard by Johann Sebastian Bach. In the German of Bach's time Clavier (keyboard) was a generic name indicating a variety of keyboard instruments, most typically a harpsichord or clavichord – but not excluding an organ either.Wikipedia, The Well-Tempered Clavier
The employment of a musical scale of twelve equal divisions between the octave is taken for granted, but the theory behind this greatest of musical big bangs is truly marvellous. Pythagoras decided one day to stack twelve perfect fifths on top of each other - try it on your piano - you get from bottom A to top A. He found, to his great interest no doubt, that although the fifths were pure (in fact, it was because of this), top A was sharp to the bottom by a quarter of a tone. Apply this to twelve divisions between the octaves, and you find that the only way to create equal frequency gaps between the semitones is by multiplying frequencies by the twelfth root of two.
This gives Equal Temperament, allowing us to move freely around all of the keys, major and minor, without having to alter the tuning. J. S. Bach championed the cause by demonstrating it practically, in his astonishing Well-Tempered Clavier, known as ‘The 48’. Bach knew that without this innovation, keyboards could only play in a small selection of keys, for a given tuning; these tunings, called Temperaments, were also known as Mean-Tone tuning. There were many different temperaments, and therefore the performer had to be sure to use the temperament the composer specified for a particular performance. The late adoption of equal temperament in the UK (late-1800s!) hampered the development of music generally here, allowing Germany a massive leap forward, and between the years of Purcell and Britten, Britain became known as the music-less land.
To demonstrate, try this: enter 220 into your calculator (220Hz is the frequency of the A below middle C on your piano, when correctly tuned). Multiply this by 1.059463, and each subsequent product, by this number (the Semitone Multiplier) eleven more times times, and you arrive at 439.99944 - i.e. A=440, as near as mathematics allow. This not only gives you the octave, but twelve divisions equally spaced in between. So you see, the Greeks not only invented democracy in government, but also a democratically-aligned system of tuning - over two thousand years before the great J. S. Bach was able to demonstrate the principle so forcefully in his monumental 48.
The skill of the accomplished piano tuner is to be able to practically apply such precise theory to pianos as esoteric and diverse as, for example, Mrs Smith’s old Cottage Upright piano from the 1890s, perhaps untuned in the last ten years, or the majestic Steinway concert grand Model D on the concert platform.
Number is the ruler of forms and ideas, and the cause of gods and daemons.As quoted in Life of Pythagoras (c. 300) by Iamblichus of Chalcis, as translated by Thomas Taylor (1818)
Bring me a bowl of coffee before I turn into a goat.Johann Sebastian Bach
Oh no! Another overdamper!!!As quoted, with sadness, on a more-or-less weekly basis