Viiø7

Definition

The viiø7 chord is a half-diminished seventh chord built on the seventh degree of a scale, consisting of a root, minor third, diminished fifth, and minor seventh. This chord plays a crucial role in tonal harmony as it often functions as a secondary leading tone chord, resolving to the tonic of the key. It helps create tension that resolves smoothly into more stable chords.

5 Must Know Facts For Your Next Test

1. The viiø7 chord is typically used in major keys and functions as a leading tone to the tonic, often resolving to I or i.
2. It is built from the seventh scale degree and includes the notes: root (leading tone), minor third, diminished fifth, and minor seventh.
3. In part writing, it's important to voice the viiø7 chord correctly to maintain smooth voice leading, ensuring that each voice moves by step when possible.
4. The viiø7 can also appear in minor keys and is frequently used in harmonic progressions leading to the dominant chord.
5. When resolving a viiø7 chord to the tonic, typically the root and seventh move down by step while the third and fifth usually move up by step.

Review Questions

• How does the viiø7 chord function within harmonic progressions, particularly in relation to the tonic?
  • The viiø7 chord functions as a leading tone chord that creates tension before resolving to the tonic. Its structure provides a strong pull towards the tonic because of its dissonant intervals. In harmonic progressions, this tension is essential for creating movement and resolution, enhancing the overall harmonic narrative.
• Discuss how voice leading principles apply when part writing for a viiø7 chord.
  • In part writing for a viiø7 chord, voice leading principles dictate that each note should ideally move by step to maintain smooth transitions. For example, when resolving to the tonic, the root should descend while other voices may ascend or descend by step. This careful attention to voice movement enhances the coherence of harmonic progressions and avoids awkward leaps between pitches.
• Evaluate the impact of using viiø7 chords on the overall harmonic texture and progression within a piece of music.
  • Using viiø7 chords significantly enriches the harmonic texture by introducing moments of tension that require resolution. This tension adds depth to musical phrases and contributes to a sense of forward momentum within the progression. When strategically placed, viiø7 chords can elevate emotional intensity in music, making their eventual resolution to the tonic feel satisfying and impactful.

Related terms

Diminished Chord:

A chord made up of two minor thirds stacked on top of each other, resulting in a root, minor third, and diminished fifth.

Leading Tone:

The seventh scale degree in a diatonic scale, which is one half step below the tonic and creates a strong pull to resolve to it.

Secondary Dominant: A dominant chord that resolves to a chord other than the tonic, often used to temporarily tonicize a diatonic chord.