Why do music key signatures work? Is there science behind why music scales sound good only with the correct notes?

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Answer 1

It’s worth mentioning that scales work the same way regardless of the key signature.

If you could assign numbers to the notes instead of letters, the distance between each note is the same for any key signature. The only difference is where you start.

Once youve learned the major scale in one key signature, you’ve got the theory down for every key signature.