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Hoots : Can you determine if a note is sharp vs flat if it doesn't feature in the scale? Given the scale Lydian in the key of C we can determine that the F# (rather than Gb) is indeed an F# as it doesn't appear elsewhere in the scale. - freshhoot.com

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Can you determine if a note is sharp vs flat if it doesn't feature in the scale?
Given the scale Lydian in the key of C we can determine that the F# (rather than Gb) is indeed an F# as it doesn't appear elsewhere in the scale.

How can you determine if a note is sharped or flatted if it doesn't exist in the scale? For example if Ab should be a G#?

Does it even make sense to imagine out of scale notes like this or am I thinking about it incorrectly?


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Standard 7 note diatonic scales need to contain one of each letter name. Where there are chromatic notes, they will depend on what the original note was that's changed. For example, in key C, where the harmony makes an F minor chord, the changed note will be A♭, whereas the same pitch note making a C augmented chord will have the G changed to G♯.

When an interval is changed from major to minor, or diminished, the original note will be flattened or double flattened. If it's P5 and that gets augmented, it'll be sharpened. Not written as the next note up flattened. That way, readers can see how the harmony has changed, technically.


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