For calculating purpose, the fundamental is chosen from standard pitch, A4=440 Hz. In practice, it can use any pitches. The unison and octaves of fundamental have zero deviation because it's assumed to be perfectly match to Equal-Tempered counterpart.
Why we can’t sing in public wherever and whenever we want
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I was on holiday in Portugal recently when I heard a group of young people
coming towards me singing. It seemed like it was some kind of street
protest a...
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