An augmented chord is a type of triad formed by combining a root note, a major third, and an augmented fifth, which is a raised fifth interval. This unique structure creates a sense of tension and instability, often leading to resolution in harmonic progressions. Augmented chords can be found within the context of diatonic harmony and minor scales, playing a critical role in creating interesting musical textures and modulations.
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An augmented chord is typically not diatonic to most scales but can be derived from altering the fifth of a major or minor triad.
Augmented chords are commonly notated as 'aug' or with a plus sign (+) following the root note.
They can function as dominant chords leading to resolutions in both major and minor contexts.
In minor scales, the augmented chord can occur naturally as the third degree when using harmonic minor.
The structure of an augmented chord creates symmetrical intervals, allowing for various transpositions and alterations.
Review Questions
How does an augmented chord differ from diatonic triads in terms of construction and function?
An augmented chord differs from diatonic triads primarily in its interval structure. While diatonic triads are constructed using notes strictly from a specific scale, an augmented chord uses an altered fifth interval that creates tension. This tension leads to resolutions that are often utilized in harmonic progressions, providing contrast and movement within a piece.
Discuss the role of augmented chords in the context of minor scales and how they can enhance musical expression.
In minor scales, especially when using the harmonic minor variation, augmented chords often appear as the third scale degree. This creates unique harmonic possibilities that enhance emotional expression in music. By introducing an augmented chord, composers can create unexpected shifts in harmony that evoke feelings of longing or urgency, enriching the overall musical narrative.
Evaluate the significance of augmented chords in harmonic progression and their impact on musical modulation.
Augmented chords play a significant role in harmonic progression due to their inherent tension and instability. Their unique structure allows them to serve as pivot points for modulation, facilitating transitions between keys. The symmetrical nature of their intervals enables composers to explore different tonal areas creatively, making augmented chords essential tools for composers seeking to innovate within traditional harmonic frameworks.
Related terms
Diatonic Triad: A diatonic triad is a three-note chord built from the notes of a specific scale, following the pattern of intervals defined by that scale.
Minor Chord: A minor chord is a triad that consists of a root note, a minor third, and a perfect fifth, commonly used to evoke a somber or melancholic mood.
The leading tone is the seventh scale degree in a scale, which has a strong tendency to resolve up to the tonic, often found in minor scales and related to augmented chords.