There’s also a standard of using the metric system, but there are still plenty of backwards places that don‘t follow it. One of the instruments I play is flute and while there is some flexibility possible to adjust the pitch by moving the headjoint in or out, there is an idealized pitch for the best intonation.¹ Most student instruments are A440 but some intermediate and professional models are tuned to A442 or A444.

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1. Granted, the player’s technique also affects intonation so this is not insurmountable.