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.
10 foolproof ways to stand out in your choir
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It’s important for singers to feel wanted and to know that they play an
important part in their choir.
But if nobody notices you, how will you ever shin...
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