The harmonic minor scale is a modified form of the natural minor scale developed to solve a specific harmonic problem in Western tonal music. It alters one pitch to strengthen harmonic direction while preserving the minor tonal center.
Rather than replacing the natural minor scale, harmonic minor exists alongside it, used primarily for harmonic clarity and cadential strength.
Definition of the Harmonic Minor Scale
The harmonic minor scale is a seven-note diatonic scale derived from the natural minor scale by raising the seventh scale degree.
piano-ology-scales-c-harmonic-minor-notationThe interval pattern is:
Whole step
Half step
Whole step
Whole step
Half step
Whole step and a half
Half step
Starting on A, the harmonic minor scale is:
A, B, C, D, E, F, G sharp, A
The raised seventh creates a leading tone that resolves strongly to the tonic.
Why the Harmonic Minor Scale Exists
In the natural minor scale, the seventh scale degree lies a whole step below the tonic. This weakens dominant harmony and softens cadential resolution.
By raising the seventh scale degree:
the dominant chord becomes major
the leading tone gains directional pull
authentic cadences become clearer
The harmonic minor scale was introduced to restore the functional strength of dominant harmony in minor keys.
The Augmented Second
One distinctive feature of the harmonic minor scale is the augmented second between the sixth and seventh scale degrees.
In A harmonic minor, this occurs between F and G sharp.
This wide melodic interval:
creates a distinctive sound
can feel angular or exotic
influenced melodic writing choices
Historically, this interval shaped melodic practice and led to further modifications of the minor scale.
Harmony Derived from the Harmonic Minor Scale
The harmonic minor scale produces a different set of diatonic chords compared to natural minor.
Key harmonic changes include:
a major dominant chord
a fully diminished leading tone chord
altered submediant harmony
These changes enable stronger functional harmony and clearer tonal resolution.
Harmonic vs Melodic Use
Despite its name, the harmonic minor scale is not used exclusively in harmony.
In practice:
harmonic minor often appears in cadences
melodic lines may selectively use the raised seventh
composers switch between natural and harmonic minor within a piece
The scale functions more as a pitch resource than a rigid system.
Relationship to the Natural Minor Scale
The harmonic minor scale preserves the tonic, mediant, and dominant relationships of natural minor while altering only one pitch.
This balance allows music to:
retain minor tonality
strengthen harmonic motion
avoid full modal transformation
It is best understood as a targeted modification rather than a separate tonal system.
