Originates from monk chants. They only sang in the C major key. They used the dots to represent the notes in the scale. Tails were later added to represent time length.
They then started to sing in C mixolydian, where instead of a B, you sang half way between a A and B, creating a flattened B.
In some European countries, the B was considered a hard B and the B flat was considered the soft key. So in German music, Bb is called B and B is called H for hard.
Then people stated to sing and play in more keys, this required the use of more notes, and these all had to be fit around C major. So we have sharps and flats.
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