The scale with a lowered seventh is the Mixolydian scale. You might be looking for the Hijass scale .
bending (lowering) the 3rd, 5th, and 7th scale degree
In a melodic minor scale, the 6th and 7th degree of the scale is raised up 1 half step on the way up the scale. On the way back down the scale, the 6th and 7th are back down to the natural form of the minor.
Bb Harmonic Minor has 4 flats, since in the harmonic version of the scale the A flat (7th degree) is raised to A natural.
Melodic Minor
If that's a minor V moving to a IV chord, then no, it's not allowed. A minor V doesn't fit in anywhere in a major key, nor is V permitted to move directly to IV. To have a lowered 7th scale degree in the 2nd chord, leading to IV, try a V7/IV. It's a I chord with a minor 7th in it, working as a secondary dominant.
When ascending, the melodic minor scale has a raised 6th and 7th scale degree, but those two notes are lowered when descending.
bending (lowering) the 3rd, 5th, and 7th scale degree
In a melodic minor scale, the 6th and 7th degree of the scale is raised up 1 half step on the way up the scale. On the way back down the scale, the 6th and 7th are back down to the natural form of the minor.
Raises the 7th degree of that scale.
Raises the 7th degree of that scale.
The aeolian scale is a type of minor scale, specifically the natural minor scale. The main difference between the two is that the aeolian scale has a lowered 6th and 7th degree compared to the major scale, while the minor scale can have different variations like harmonic or melodic minor with different alterations to certain degrees.
The melodic minor scale is played differently when ascending and descending. When ascending, the scale is played with a raised 6th and 7th note, while when descending, the scale is played with a lowered 7th and 6th note.
The leading tone in a scale is the 7th scale degree, one half-step below the tonic.
The melodic minor scale is played ascending with a raised 6th and 7th note, while it is played descending with a lowered 7th and 6th note.
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They use a lowered 3rd and 7th, and add a raised 4th.
To construct a major scale with a flat 6th and 7th degree, you would use the formula: Whole, Whole, Half, Whole, Whole, Whole, Half.