La is the musical tone, used to tune a musical instrument, at least that is the case in the Westen world of music. There is a simple tool called a Tuning fork, that gives the exact tone of La. The chemical compounds and the way it is being made will always generate a vibration of 440 cycles per second or Hertz.
A musician would strike the tuning fork and tune the string of his/hers instrument that represents La. From there it's possible to tune all the other notes.
In Nazi Germany, the Minister Of Propaganda Joseph Goebbels ordered in 1939 to replace all tuning forks to 440Hz. Before that period instruments were tuned 8 Hz lower to 432Hz.
When you compare the same composition in 432Hz and 440Hz there's definitely a difference. There are many theories why we still listen to music at 440Hz, some even claim that 432 is in harmony with the vibration Universe and now we are blocked from this "channel". Personally, I don't agree with the conspiracy theories, partly because I work with music and audio for a living and it contradicts my understanding of sound and how I utilize it.
To me, 440Hz and 432Hz are different flavors of the same thing. Some people prefer to tune their instruments to 432hz others to 440Hz. It's more like a personal preference.
Nevertheless, let's check out some of the theories out there.
- The tone La at 432Hz was intentionally hidden from the world because it's a balance point in nature. 432Hz is a vibration having roots in The Golden Ratio and combines the properties of light, time, space, matter and gravity into biology, DNA and consciousness.
A=432 Hz, known as Verdi’s ‘A’ is an alternative tuning that is mathematically consistent with the universe. Music based on 432Hz transmits beneficial healing energy because it is a pure tone of math fundamental to nature. - Brian T Collins
- Earth's frequency is 8hz. When the brain is relaxed, its alpha waves are also 8Hz. When we listen to music at 440Hz, the root tone is changed from 8Hz to 8.25 Hz, meaning the harmonics are not in tune with The Universe. (Remember that the next time you listen to Dubstep.)
- Humans vibrate from 16 to 32 Hz, the same as C0 to C1 on a musical scale. 440 Hz is not in tune with the human's vibration because the root tone is 16.5 Hz.
- It's claimed that listening to 440 Hz will make you tired and apathetic.
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https://steemit.com/music/@rossenpavlov/why-and-why-changed-music-s-tuning-frequency-from-432-to-440-hz