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The natural major scale on C has the notes: C, D, E, F, G, A, B. What is the difference between natural major, harmonic major, and melodic major scales. What notes of the natural major are changed in harmonic/melodic major?

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    The sixth and seventh scale degrees are lowered or raised to produce the various minor scales. There are several existing posts that go into the details. – Michael Curtis Dec 16 '19 at 17:13
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    Just googled 'harmonic major' and got the notes (in key C)- C D E F G G# B. Surely that ain't right? – Tim Dec 16 '19 at 17:33
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    My answer to this question goes into some detail that you might find helpful: music.stackexchange.com/questions/91091/… – WillRoss1 Dec 16 '19 at 18:16
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    Well, the harmonic major scale is the major scale with a flatted sixth? But what about the melodic major? – TechnicGoblin5R Dec 16 '19 at 18:21
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    @Tim: It's wrong, but enharmonically correct. It should be C D E F G Ab B. – Matt L. Dec 16 '19 at 18:41
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The harmonic major scale has a lowered 6th scale degree:

1 2 3 4 5 b6 7

The only difference with the harmonic minor scale is the major third, so harmonic major can be obtained from the harmonic minor scale by raising the third.

Raising the third of the melodic minor scale results in a standard major scale, so that's not the way melodic major can be derived.

The term "melodic major" is actually hardly used, but it usually refers to the 5th mode of the melodic minor scale with scale degrees

1 2 3 4 5 b6 b7

This scale is more commonly (and more understandably) referred to as mixolydian b6.

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From what I understand, Harmonic Major flattens the 6th degree of natural major: [C D E F G A♭ B]. Melodic Major flattens the 6th and 7th degree of natural major: [C D E F G A♭ B♭].

As for why: The upper tetrachord of harmonic major is identical to that of harmonic minor. For melodic major, the modified 6th and 7th give the scale its "melodic" moniker. AFAIK, these scales are played identically both ascending and descending.

Another possible reasoning for the name of melodic major is from its identity as a mode of melodic minor (the 5th mode, to be specific).

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