Music
While some instruments (trombone, theremin, etc.) can play a tone at any arbitrary frequency, other instruments (such as pianos) can only play a limited set of tones. The very popular "twelve-tone equal temperament" selects tones from the geometric sequence
where k is typically 440 Hz, though other standards have been used. However, other less common tuning systems have also been historically important as preferred audio frequencies.
Since 210≈103, 21/12≈103/120=101/40, and the resultant frequency spacing is very similar to the R40 series.
Read more about this topic: Preferred Number
Famous quotes containing the word music:
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Haunting untrodden paths to wail apart;
My pleasures horror, music tragic notes,
Tears in mine eyes and sorrow at my heart.
If this be love, to live a living death,
Then do I love and draw this weary breath.”
—Samuel Daniel (1562–1619)
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—Henry David Thoreau (1817–1862)
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—Mark Twain [Samuel Langhorne Clemens] (1835–1910)