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Motion of an A-440 tuning fork (greatly exaggerated) vibrating in its principal mode A tuning fork is a fork-shaped acoustic resonator used in many applications to produce a fixed tone. The main reason for using the fork shape is that, unlike many other types of resonators, it produces a very pure tone , with most of the vibrational energy at ...
A440 (also known as Stuttgart pitch [1]) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A 4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.
The tuning fork was invented in 1711, enabling the calibration of pitch, although there was still variation. For example, a 1740 tuning fork associated with Handel is pitched at A = 422.5 Hz, ⓘ while a specimen from 1780 is pitched at A = 409 Hz, ⓘ about a quarter-tone lower. [4]
An A440 tuning fork A common method of tuning the piano begins with tuning all the notes in the "temperament" octave in the lower middle range of the piano, usually F3 to F4. A tuner starts by using an external reference, usually an A440 tuning fork , (or commonly a C523.23 tuning fork) to tune a beginning pitch, and then tunes the other notes ...
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A tuning fork or electronic tuning device may be used as a reference pitch, though in ensemble rehearsals often a piano is used (as its pitch cannot be adjusted for each performance). Symphony orchestras and concert bands usually tune to an A 440 or a B♭ , respectively, provided by the principal oboist or clarinetist , who tune to the ...
Other stoppages have been much shorter, with economic analyses after the fact often showing that the lost money is then returned to the US economy in nearly equal measure after the government reopens.
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