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Here is a table giving the frequencies in Hz of musical pitches, covering the full range of all normal musical instruments I know of and then some. It uses an even tempered scale with A = 440 Hz.

  CC#D EbEF F#GG# ABbB
016.3517.3218.3519.4520.6021.8323.1224.5025.9627.5029.1430.87
132.7034.6536.7138.8941.2043.6546.2549.0051.9155.0058.2761.74
265.4169.3073.4277.7882.4187.3192.5098.00103.8110.0116.5123.5
3130.8138.6146.8155.6164.8174.6185.0196.0207.7220.0233.1246.9
4261.6277.2293.7311.1329.6349.2370.0392.0415.3440.0466.2493.9
5523.3554.4587.3622.3659.3698.5740.0784.0830.6880.0932.3987.8
6104711091175124513191397148015681661176018651976
7209322172349248926372794296031363322352037293951
8418644354699497852745588592062726645704074597902

The octave number is in the left column so to find the frequency of middle C which is C4, look down the "C" column til you get to the "4" row : so middle C is 261.6 Hz.

Some Specific Notes

Middle C is C4=261.6Hz

Standard tuning fork A is A4=440Hz

Piano range is A0=27.50Hz to C8=4186Hz

Guitar strings are E2=82.41Hz, A2=110Hz, D3=146.8Hz, G3=196Hz, B3=246.9Hz, E4=329.6Hz

Bass strings are (5th string) B0=30.87Hz, (4th string) E1=41.20Hz, A1=55Hz, D2=73.42Hz, G2=98Hz

Mandolin & violin strings are G3=196Hz, D4=293.7Hz, A4=440Hz, E5=659.3Hz

Viola & tenor banjo strings are C3=130.8Hz, G3=196Hz, D4=293.7Hz, A4=440Hz

Cello strings are C2=65.41Hz, G2=98Hz, D3=146.8Hz, A3=220Hz

Coda

Bear in mind that everything here is in relation to the even tempered (aka equal tempered) scale, where an octave is a frequency ratio of exactly two and a semitone is a frequency ratio of exactly the twelfth root of two. In the real world however many different temperaments may be used - see en.wikipedia.org/wiki/Musical_temperament - and octaves too can vary in size, see en.wikipedia.org/wiki/Stretched_octave.

Also we call middle C "C4" : this is the commonest octave numbering but some people call middle C "C3" or even "C5".


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