I've been reading about this as well, but can't come to any conclusions about who exactly changed the standard tuning from A432 to A440. Some say Bach, some Goebbels, it goes all over the place...

Two interesting bits I found said Verdi's music was composed and originally played at A432, and that the original Stradivarius violins were designed to be tuned to A432.

Also 432 squared is 186,624, which comes close to Einstein's figure for the speed of light - 186,282 miles per second.

Aaand, if you plot the Pythagorean tuning for the C-Major scale on a 360 degree wheel, the wheel is based on 16 divisions, and if you set middle C as 256Hz (A432 tuning), you get 16 sections of 16Hz in the wheel.

One thing that caught my eye was when I calculated the hertz frequencies for the C-Major scale in 432. I posted this on my facebook as well, but here it is... I find it fascinating that the cycles per second work out to whole numbers with A432 and NOT with A440. Seems to make sense that this tuning would "feel better" to the human ear.

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**Modern Standard Tuning (A = 440 hz, C = 261.63 hz)**Sources:

http://www.phy.mtu.edu/~suits/notefreqs.html and

http://www.sengpielaudio.com/calculator-notenames.htmNote Frequency (hz)

- Mid Low (1 octave below middle C)

C 130.81

D 146.83

E 164.81

F 174.61

G 196

A 220

B 246.94

- Mid (middle C)

C 261.63

D 293.66

E 329.63

F 349.23

G 392

**A 440 **B 493.88

- Mid High (1 octave above middle C)

C 523.25

D 587.33

E 659.26

F 698.46

G 783.99

A 880.00

B 987.77

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**Stradivari/Verdi Tuning (A = 432 hz, C = 256 hz)**Calculated using the Pythagorean method of 3:2 ratio for dominants, 11:8 for sub-dominants, 2:1 for octaves.

Note Frequency (hz)

- Mid Low (1 octave below middle C)

C 128

D 144

E 162

F 176

G 192

A 216

B 243

- Mid (middle C)

C 256

D 288

E 324

F 352

G 384

**A 432** B 486

- Mid High (1 octave above middle C)

C 512

D 576

E 648

F 704

G 768

A 864

B 972

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edit: WIN32, did you post this originally in baked noodles? it doesn't seem that baked to me...