Common mistake
Treating the black keys as extras
It sounds like this
“The black keys are just extra notes — the white ones are the real ones.”
Why it’s wrong
Every key is a note one half step from its neighbours; leave the black keys out and the distances stop adding up.
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.