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Assuming the frequency of Middle C to be 261.63 hertz, accurate to two decimal places, taking this two octaves down brings us to 65.41 hertz. Sending us down a further semitone gives us 65.41 x 1/21/12, which sends us to B, at a frequency of 61.74 hertz, accurate to two decimal places, the closest possible genuine note to a 60 hertz frequency.
Effectively, this is the third B below middle C, including that which is a semitone below.
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