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.
You have to accept where you are as a singer or choir leader before you can
improve
-
Many of us want things to be other than they are. Perhaps you dream of
being an amazing singer, rather than the struggling beginner that you
actually are...
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