Originally Posted By: HearToLearn
Thanks Mario. I mean it more as, it simply eliminates any non key notes, leaving only the notes in that key.
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I'm not certain how useful this would be.

It is far from uncommon to have a passing note that is outside the nominal key of the song. Particularly if you have a key change that is not notated but rather handled by a few accidentals because it only lasts a few bars.

Then there's the very common use of chromatic runs.


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