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:
“On the first days, like a piece of music that one will later be mad about, but that one does not yet distinguish, that which I was to love so much in [Bergotte’s] style was not yet clear to me. I could not put down the novel that I was reading, but I thought that I was only interested in the subject, as in the first moments of love when one goes every day to see a woman at some gathering, or some pastime, by the amusements to which one believes to be attracted.”
—Marcel Proust (1871–1922)
“People today are still living off the table scraps of the sixties. They are still being passed around—the music and the ideas.”
—Bob Dylan [Robert Allen Zimmerman] (b. 1941)
“Not to sink under being man and wife,
But get some color and music out of life?”
—Robert Frost (1874–1963)