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.
It's a hobby, right? — The hidden work of a choir leader
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I’m officially on my summer break. My last singing workshop was just over
two weeks ago.
But that doesn’t mean I’m taking it easy or lazing by the pool....
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