Why are there only 7 musical notes? Was it decided to divide sounds like that or are there no more in nature?
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There are actually 12 notes. It’s called 12 tone equal temperament. The piano has 7 white notes, and 5 black notes. 12 in total (before repeating of course).
All 12 notes are equal distance apart from the next one, therefore ‘equal temperament’.
It’s a convention that developed in western music, and I believe a large part of why is that large orchestra needed to be able to play together and sound in-tune with each other.
Other parts of the world have used different types of tuning.
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