Prerequisites for Minor Key Harmony and Essential Concepts

How do the natural, harmonic, and melodic minor scales differ in their construction and usage?

The natural minor scale uses the same notes as its relative major. Harmonic minor raises the seventh degree to create a leading tone, while melodic minor raises both the sixth and seventh degrees when ascending to smooth out the augmented second interval found in harmonic minor. A lot of people assume you must play melodic minor descending exactly as you play it ascending, but in standard practice, the sixth and seventh degrees return to their natural minor forms on the way down to emphasize the tonic.

What is the relationship between relative major and minor keys?

Relative major and minor keys share the exact same key signature because they contain identical pitch collections, though they emphasize different tonal centers.

• Three semitones: This is the precise distance between the root of a major key and its relative minor.
• Tonic focus: The major key centers on the first scale degree, while the relative minor centers on the sixth degree of that same major scale.
• Chord sets: Both keys utilize the same seven diatonic triads, simply reordered to reflect their respective tonal centers and functional roles.

How are primary and secondary triads constructed within a minor key context?

Primary triads in minor keys consist of the tonic, subdominant, and dominant, which are built on the first, fourth, and fifth scale degrees. In a minor key, the dominant triad is made major by raising the third of the chord to create a strong pull toward the tonic.

What role does the leading tone play in establishing harmonic tension in minor keys?

The leading tone provides the necessary half-step resolution to the tonic, which is the primary mechanism for establishing cadential closure in minor.

• One semitone: This is the interval between the raised seventh scale degree and the tonic, creating the gravitational pull required for resolution.
• Harmonic minor: This scale form is specifically employed to provide that sharp leading tone, which is absent in the natural minor scale.
• Dominant chord: The leading tone functions as the major third of the V chord, intensifying the dissonance that demands resolution to the i chord.

How do chord progressions in minor keys utilize borrowed chords from the parallel major?

Minor key progressions frequently borrow chords from the parallel major to soften the darkness of the minor tonality or to provide a brighter harmonic color. This process, known as modal interchange, allows composers to use the major IV or major VI chords within a minor context. For instance, in A minor, using a D major chord instead of the diatonic D minor creates a more uplifting, bluesy sound that temporarily shifts the listener's expectation toward the parallel major key.

However, borrowing does not mean changing the entire key signature. The tonic chord of the minor key usually remains minor to maintain the overall tonal identity. If you borrow too many chords, the listener may perceive a modulation to the parallel major rather than a simple infusion of color.

What are the functional differences between the subdominant and dominant chords in minor tonality?

The subdominant chord, typically minor, serves to prepare the dominant, while the dominant chord is altered to be major to create a strong resolution. The dominant chord contains the raised seventh degree, which is exactly one half-step away from the tonic note.

How does voice leading change when transitioning between different versions of the minor scale?

Voice leading in minor keys requires careful management of the sixth and seventh scale degrees to avoid awkward melodic leaps. When moving from the natural minor to the harmonic minor, the sudden introduction of the raised seventh can create an augmented second if the sixth degree is not handled correctly. For example, moving from the sixth degree to the raised seventh often necessitates a specific melodic path to keep the lines smooth and avoid the jarring, wide interval that disrupts the vocal or instrumental flow.

An exception exists in jazz and certain contemporary styles where the augmented second is embraced for its exotic, Middle Eastern-influenced sound. In these contexts, composers intentionally highlight the interval between the flat sixth and the raised seventh to create tension, ignoring traditional classical voice-leading rules that prioritize stepwise motion.

Why is the raised seventh degree essential for creating authentic cadences in minor keys?

The raised seventh degree is essential because it transforms the weak minor dominant chord into a major dominant, creating a powerful pull toward the tonic. Without this alteration, the cadence lacks the necessary tension to signal a definitive end to a musical phrase.

Use these values to make sure your V-i cadences sound resolved rather than ambiguous.