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This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.
Because these keys receive less wear, they are often made of black colored wood and called the black notes or black keys. Black keys form a pentatonic scale. The entire pattern repeats at the interval of an octave. The arrangement of longer keys for C major with intervening, shorter keys for the intermediate semitones date to the 15th century.
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Sholes chose the size of the keys to be on three-quarter [3 ⁄ 4, or 0.75] inch centers (about 19 mm, versus musical piano keys which are 23.5 mm or about 0.93 inches wide). 0.75 inches has turned out to be optimum for fast key entry by the average-size hand, and keyboards with this key size are called "full-sized keyboards".
The pedal piano (or pedalier piano) [12] is a kind of piano that includes a pedalboard [13] There are two types of pedal piano: A pedal board integrated with a manual piano instrument, using the same strings and mechanism as the manual keyboard; An independent, pedal played piano with its own mechanics and strings, placed below a regular piano
Stretched tuning is a detail of musical tuning, applied to wire-stringed musical instruments, older, non-digital electric pianos (such as the Fender Rhodes piano and Wurlitzer electric piano), and some sample-based synthesizers based on these instruments, to accommodate the natural inharmonicity of their vibrating elements.
A child playing a Casio keyboard with small-size minikeys. Minikeys: Most electronic keyboards have keys that are similar to the size of keys on an acoustic piano. Some electronic keyboards have minikeys, either because they are targeted at child users or to make the instrument smaller and more portable.
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 in the "temperament ...
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