Lots of reasons could apply. Here’s one that wasn’t mentioned yet: color.

Some folks, especially those with perfect pitch, say that tones, and therefore keys, have a feel (like bright, or somber) and can even see the pitch as a color.

Have a little fun and see if you believe this: https://glasses.withinmyworld.org/index.php/2012/08/18/chord-colors-perfect-pitch-and-synesthesia


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