Ab harmonic minor

Construction

Step pattern (W = whole step, H = half step): W-H-W-W-H-A-H (A = 3 half steps, called an augmented second).

Formula (intervals from the root): 1-2-b3-4-5-b6-7.

Harmonic minor is natural minor with a raised 7th -- that single change creates a leading tone and gives minor keys their dominant function. It sits at the center of the minor system -- the three related minor scales (natural minor, harmonic minor, and melodic minor) that together define how minor keys work.

Origin and Relationships

Harmonic minor is a parent scale. Each of its seven modes is a scale built by starting on a different degree of harmonic minor and treating that note as the new root:

• 1st -- Harmonic Minor: Minor with a leading tone and an augmented second.
• 2nd -- Locrian natural 6: Locrian brightened by a natural 6 instead of b6.
• 3rd -- Ionian #5: Major scale with an augmented 5th -- bright and expansive.
• 4th -- Dorian #4: Dorian with a raised 4th, common in Romanian folk music.
• 5th -- Phrygian Dominant: Major 3rd over a b2 -- the flamenco and klezmer sound. This is the most widely used mode in the family and the scale played over the V7 chord built below.
• 6th -- Lydian #2: Lydian with an augmented second from the root.
• 7th -- Superlocrian bb7: The most diminished mode -- every upper degree is flatted.

Harmonic Context

In Roman numeral analysis (uppercase = major, lowercase = minor):

• i (minor): Tonic triad. The leading tone pulls melodies back here.
• V7 (dominant seventh): The reason harmonic minor exists. Raising b7 to 7 turns the v chord into V7, creating dominant-to-tonic resolution in minor.
• bIII+ (augmented -- raised 5th): Built on b3, this augmented triad is one of harmonic minor's most distinctive chords -- its unstable, shimmering quality appears often in classical and neo-soul progressions.
• bVI (major): Bright contrast against the minor tonic, often moving to V7.
• vii° (fully diminished -- stacked minor thirds): Built on the leading tone. Strong pull toward i, often used as a passing chord.

Characteristic Tones

The intervals that give this scale its distinctive sound:

• 7 (leading tone): The defining alteration. One half step below the root, it creates the gravitational pull that natural minor lacks.
• b6: Carries the darkness of natural minor into harmonic minor, keeping the scale unmistakably minor despite the raised 7th. Compare to melodic minor: melodic minor raises b6 to natural 6, smoothing out the augmented second but losing some of this darkness.
• The b6-to-7 augmented second: This 3-half-step leap is the scale's most recognizable melodic fingerprint -- it is what Western ears often associate with Middle Eastern and Eastern European music.

Melodic Applications

The augmented second between b6 and 7 is both the scale's signature and its challenge. Lean into it for dramatic color, or smooth through it with passing tones when you want subtlety. The leading tone should resolve upward to 1 -- that resolution is the entire reason this scale was developed. Over V7 chords in minor, emphasize the chord's root and 3rd to anchor your phrases in the dominant sound, letting the scale's b6 add tension above.

Practice Seeds

Leading tone pull. Play the scale ascending and pause on 7 before resolving to 1. Feel how the raised 7th demands resolution -- this is the engine of minor-key harmony.

Augmented second isolation. Play the b6-to-7 interval in different octaves and rhythms. Train your ear to recognize this 3-half-step leap instantly -- it is the sound that separates harmonic minor from natural minor.

V7-to-i cadence. Improvise short phrases using harmonic minor over a V7-i progression. Notice how the leading tone and b6 together create tension that resolves cleanly to the minor tonic.

Natural minor comparison. Play the same melodic phrase using natural minor, then harmonic minor. Hear what the raised 7th changes -- phrases that floated now drive toward resolution.