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Common mistake

Believing minor keys are the ones with black keys

It sounds like this

“Minor keys are the ones where you play the black keys.”

Why it’s wrong

A minor uses only white keys, and plenty of major keys use black ones; it is the pattern from the home note that decides.

The lesson that fixes it

Cognosc spots mistakes like this.

When you explain something in your own words, Cognosc can tell exactly which mistake you’re making — not just that you’re wrong — and gives you a short lesson to fix that one thing.