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.
Some want to sit. Some want to stand. Now what?
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When I ran community choirs, I used to insist that singers stood during
rehearsals. But some complained that their legs ached by the end of the
evening. ...
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