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The most common hertz for a tuning fork is the 440 Hz which is considered the standard concert pitch, or called Concert C. The 440 Hz, as a musical pitch, was adopted by the American Standards Association in 1936 and later by the International Organization for Standardization in 1955. But this is not without controversy.

Before using the 440 Hz as a standard frequency, other frequencies such as the 442 Hz and 443 Hz. were used. Before standardization, it would not be unusual to have an English pitch pipe in the 1700s using a 380 Hz while one organ would have an ‘A’ pitch of 480 Hz. in Hamburg, and another organ using 409 Hz. As the world became a smaller place, it became increasingly difficult for a musician that played in one orchestra to move to another country and play in a different orchestra. This was because each orchestra was tuning to their instruments to their frequencies. But singers were also complaining because the higher the pitch, the more strain was placed on the vocal chords.

In the first attempt to standardize pitch, the French government set A at 435 Hz on February 16, 1859. This standard was referred to as the French or Continental Pitch. It was the Italian composer, Giuseppe Verdi that proposed lowering the pitch to 432 Hz while others were asking for 430.54 Hz.

In England, there was a movement to create a ‘low pitch’ for the Philharmonic Society at A=439 while ‘high pitch’ was set at A=452.4 Hz. By 1834, a recommendation from the Stuttgart Conference asked for A=440 Hz and was based on studies that Scheibler made on his Tonometer. Reaffirmed in 1975 by the International Organization for Standardization, the International standard for A=440 Hz and is used by orchestras around the world including the United States and the United Kingdom. A=442 Hz is still being utilized by the New York Philharmonic and the Boston Symphony Orchestra while Russia, Sweden, and Spain use A=443 Hz.

Exceptions can be made as in the case for p performing Baroque music which uses A=415 Hz and in the German Baroque idiom, A=460-470 Hz (known as Chorton pitch). On the following page are some basic pitch associations that were used during this time.


Same Basic Pitch associations include:



Concert Pitch

440 Hz

Continental Europe Pitch

440 Hz and 444 Hz

Modern Baroque Pitch


415 Hz

Chorton Pitch (choir pitch)

466 Hz

Classical Pitch

430 Hz

French Standard Pitch

435 Hz

Philharmonic Pitch

452 Hz

European Standard

435 Hz


There exists a group that believes that A should not equal 440 Hz but should equal 432 Hz. The 432 Hz is known as ‘Verdi’s A’ and is believed to have been based on mathematics and is said to transmit healing energies to the human body. Some believe that the 440 Hz can cause disruptive behavior, agitation, and disharmony. There is still much research that needs to be done on frequencies, and their effects on the brain and energetic body.

In an article appearing in the Journal of the Royal Society of Medicine (1987), Bickerton and Barr state that it was the efforts of Colonel Somerville that finally persuaded the British army to accept the International Standard in 1929. By accepting the International Standard, French and British bands were now able to play their instruments in concert together.


For more information, please feel free to download the following pdf file that I have found on the Internet.







Unweighted Tuning Fork




Cost of tuning fork is $15.99 plus $7.99 postage inside U.S.A.

Weighted Tuning Fork-see below





Cost of tuning fork is $24.99 plus $7.99 postage inside U.S.A.