In some pianos and piano is only 85 keys (decrease is due to removal of the three highest sounds are very rare in the musical literature.
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Currently, there is some concert piano with 92 keys (54 white and 38 black) - by adding more four sounds at the bottom of the keyboard, reaching, thus, to the phase counter sub octave.).
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The relative limitations of the sound range of many high-altitude instruments (as well as singing human voices) in the musical practice is overcome by mixing them in ensembles and in orchestras (or voices).
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Despite this large number of commonly used in the music sounds different names of these sounds, there is only seven, and each of them represents a particular stage of a number of diatonic sound. These seven sounds that have their own once and for all items assigned to them are the main steps of the music system. They are located in a specific order, and correspond to the seven taken straight white keys on a piano that is as recurrent sequences are located across the keyboard.
Name system sounds.
Currently, there are two commonly used names and equitable system of sounds: character and syllable.