The piano is a universal instrument in this universe. Creating music with a pleasant sound is fundamental. And the discovery of the octave, the discovery of the sound 5 degrees above, and the sound one octave below the sound 5 degrees above. It is related to the harmonics of the vibration. Naturally, 12 notes are assigned to one octave. The mystery of prime numbers. As a result, sounds in the audible range are reasonably assigned to a large number of keys. The theory so far is completely universal in the universe. The keyboard composition that composes an octave with seven white keys and five black keys will depend on the creature used. However, this keyboard design is not the essence of the piano instrument. So the piano is never a universal musical instrument for Western music, but a universal instrument of the universe.
https://soundcloud.com/chairhouse/in-her-letter-the-one-she-put-on-the-bridge-2088-by-chair-house-09022019
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