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.
When singers want different things
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I wrote last week about how No choir can be all things to all singers. Some
singers prefer sheet music, others learn best by ear. Some love movement
and ...
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