It should be pointed out that 12-tone equal temperament is a Western invention. Many cultures have either a greater number of possible “notes” or a fewer number available. For instance, in Indian music, there are only 7 notes available:
https://en.wikipedia.org/wiki/Svara#:~:text=The%20seven%20notes%20of%20the,Pa%2C%20Dha%2C%20and%20Ni.
These systems come about through convention over millennia of making and producing music, and different cultures will build different systems.
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