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Equations for Standard A440 Concert Pitch, Twelve-Tone Equal Temperament, Chromatic scale! :D (ie, Western music scale XD)
f = 2^(p/12) * 440
p = log2(f/440) * 12
(Where f is frequency in Hz and p is pitch where A is 0, A# is 1, B is 2, Middle C is 3, the next A is 12, and so on, and it's negative for lower octaves (or rather, dodaves X3) )
:D
An interesting note (..XD) is that a musical system is fully defined (ie, you can get concrete frequencies out of it), if it has two things:
• The ratios between each note
• A single note's frequency in Hz out of all possible notes
And that's it, that does it! \:D/