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A correlation between one octave of a piano and colors of the visible spectrum:
      
Note   Frequency | Color     Color Wavelength (nm)
----   --------- | -------   ---------------------
G      396 hz    | Violet    405 
A      440 hz    | Indigo    438
B      495 hz    | Blue      473
C      528 hz    | Green     527
D      594 hz    | Yellow    580
E      660 hz    | Orange    597
F      704 hz    | Red       700

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