FUNCTIONAL HARMONY IN MINOR SCALES

The natural minor scale contains the same notes as its relative major, but it has a different tonal center. If we take a major scale and treat its sixth degree as the point of tonal gravity (the note A in the key of C), we obtain the natural minor scale. However, the scale degrees in the natural minor have a very different character from those in the major scale. For instance, the seventh degree lies a whole step below the tonic, losing its strong pull toward resolution and therefore no longer functioning as a leading tone. Likewise, the chord built on the fifth degree becomes minor due to the lowered seventh.

Because the leading tone is absent, the V–I cadence — a cornerstone of traditional functional harmony — becomes less prominent. The tritone is no longer associated with the seventh degree but instead appears on the second, and these tendencies sometimes lead resolution toward the third degree rather than the tonic. For all these reasons, the sense of tonal drive in the natural minor can feel weaker, and historically this was perceived as a problem. The response was the development of two modified forms: the harmonic minor and the melodic minor scales.

FUNCTIONAL HARMONY IN THE NATURAL MINOR SCALE

The natural minor scale essentially uses the same notes as its relative major, but its tonal center lies on the sixth degree. Among other things, this means that the seventh degree sits a whole step above the tonic rather than a half step, resulting in the absence of a leading tone.

Degree	Function	Triad	Example in A
I	Tonic	Minor	Am
II	Supertonic	Diminished	Bdim
III	Mediant	Major	C
IV	Subdominant	Minor	Dm
V	Dominant	Minor	Em
VI	Submediant	Major	F
VII	Subtonic	Major	G

SCALE DEGREES OF THE HARMONIC MINOR

The harmonic minor scale was conceived to address the lack of a leading tone and thus restore a clear sense of motion toward the tonic. The seventh degree is raised so that it lies only a semitone below the tonic once again. This new configuration is known as the harmonic minor scale and, among minor scales, it most closely reflects the aesthetic needs of the period in which functional harmony emerged.

Degree	Function	Triad	Example in A
I	Tonic	Minor	Am
II	Supertonic	Diminished	Bdim
III	Mediant	Augmented	Caug
IV	Subdominant	Minor	Dm
V	Dominant	Major	E
VI	Submediant	Major	F
VII	(Dominant)	Diminished	G#dim

SCALE DEGREES OF THE MELODIC MINOR

The melodic minor scale represents a further development of the natural minor. After restoring the leading tone through the harmonic minor, the sixth degree is also raised by a semitone, producing an interval commonly associated with the major scale. For example, in the major scale there are nine semitones between C and A, whereas between A and F there are only eight. What the melodic minor does is raise F to F♯, thereby creating a distance of nine semitones between the tonic and the sixth degree, just as in major scales. The melodic minor loses much of the “restless” character typical of minor scales and, aside from the lowered third — a crucial defining interval — it contains essentially the same intervallic structure as a major scale.

Degree	Function	Triad	Example in A
I	Tonic	Minor	Am
II	Supertonic	Minor	Bmin
III	Mediant	Augmented	Caug
IV	Subdominant	Major	D
V	Dominant	Major	E
VI	Submediant	Diminished	F#dim
VII	(Dominant)	Diminsihed	G#dim

MELODIC AND BACHIAN

The melodic minor is traditionally understood in its ascending form only. When its pitches are used both ascending and descending, the practice is sometimes referred to as “Bachian,” reflecting a more flexible historical usage.

THE LIMITS OF FUNCTIONAL HARMONY

Unless one is intentionally recreating an aesthetic associated with the eighteenth and nineteenth centuries, memorizing all these minor-scale configurations can be comparable to memorizing every scale in existence, including microtonal ones. In traditional contexts — especially when communicating with other musicians — it is important to recognize and name them. However, a more effective way to understand minor tonality is to think in terms of a tonal center with intervals orbiting around it: some fixed, others capable of being raised or lowered by a semitone. Even lowering the second degree can intensify the dramatic quality of minor, despite not belonging to these three canonical scales. Restricting oneself strictly to these systems and their corresponding chords can therefore be limiting. It is more useful to recognize the minor third as the interval that most strongly defines the dramatic atmosphere typically associated with minor, while other intervals may shift according to expressive intent — including the use of microtonal inflections.

CONCLUSION

From a practical standpoint, rather than rigidly separating these three scales, it is more beneficial to focus on ear training. Learning the color of each interval and selecting those that best suit one’s expressive goals allows for the creation of personalized scales and harmonic structures. What functional harmony ultimately reminds us is that the leading tone remains a powerful tool for generating a strong sense of resolution, even when it is not explicitly present in the reference scale.