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.
What I’ve learnt from 20 years of creating scratch choirs
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Twenty years ago, Warwick Folk Festival asked me to create a community
choir as part of its education outreach programme.
Singing Safari, Warwick 2007
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