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Augmented sixth chords are a fascinating harmonic device used in Western music to create tension and achieve a satisfying resolution. These chords, often found in classical, jazz, and contemporary music, add color and emotional depth to compositions. Understanding how to apply augmented sixth chords can enhance a musician’s expressive capabilities and enrich a song’s harmonic palette.
What Are Augmented Sixth Chords?
Augmented sixth chords are built on the interval of an augmented sixth, which spans six half-steps plus an augmented quality. Typically, these chords include the notes flat sixth and sharp fourth relative to the key, creating a dissonant sound that seeks resolution. They are often used to lead to the dominant or tonic chords, providing a sense of expectation and release.
Common Types of Augmented Sixth Chords
- Italian Augmented Sixth (It+): Contains the flat sixth, the tonic, and the augmented fourth.
- French Augmented Sixth (Fr+): Adds the second (or second degree) to the Italian form.
- German Augmented Sixth (Ger+): Includes the flat sixth, the tonic, the augmented fourth, and the second.
Harmonic Function and Usage
Augmented sixth chords are primarily used as predominant chords, creating tension that resolves to the dominant or tonic. Their dissonant intervals are typically resolved by moving the sharp fourth or flat sixth to a more stable note, often the fifth or root of the following chord. This movement produces a powerful sense of resolution and emotional release.
Example of Resolution
Consider a progression where an Italian augmented sixth resolves to a dominant chord. The flat sixth resolves upward to the fifth, and the augmented fourth resolves downward to the third of the dominant. This creates a compelling pull that guides the listener smoothly into the next harmonic space.
Applying Augmented Sixth Chords in Composition
To effectively incorporate augmented sixth chords into your compositions, consider the following tips:
- Use them as passing or neighbor chords to add tension before a key change or resolution.
- Experiment with different types (Italian, French, German) to achieve varied emotional effects.
- Combine with other chromatic harmonies to enhance musical interest.
- Ensure smooth voice leading by resolving the dissonant intervals stepwise to stable notes.
Historical Context and Examples
Augmented sixth chords have a rich history, prominently used in Baroque and Classical compositions. Composers like Beethoven and Mozart employed these chords to heighten drama and tension. In jazz, similar chromatic approaches are used to add color and complexity. Contemporary music also adopts these techniques to evoke emotional intensity.
Conclusion
Mastering the use of augmented sixth chords allows composers and performers to create compelling moments of tension and resolution. By understanding their structure and function, musicians can craft more expressive and engaging music that resonates with listeners. Experimentation and attentive voice leading are key to unlocking the full potential of these powerful chords.