An augmented chord is a fundamental concept in music theory that adds a distinctive tension and brightness to harmonic progressions. It is a type of chord that differs from more common major and minor chords by its unique interval structure, creating a sense of suspense or unresolved tension in music. Understanding what an augmented chord is, how it’s constructed, and how it’s used can deepen your appreciation of musical composition and improvisation.
What Is an Augmented Chord?
In music, an augmented chord is a triad built by raising the fifth degree of a major triad by a half step (semitone). It is denoted with the abbreviation “aug” or a plus sign (+). The defining characteristic of an augmented chord is its symmetrical structure, consisting of a root, a major third, and an augmented fifth. This structure gives the chord a distinctive, shimmering sound that is often associated with tension, brightness, or an otherworldly quality.
For example, in the key of C, a C major triad consists of the notes C, E, and G. To form a C augmented chord (C+), the G (a perfect fifth above C) is raised by a semitone to G#. The notes of a C augmented chord are therefore C, E, and G#.
It is important to note that the term “augmented” is standard in music theory and is used universally by musicians, composers, and theorists to describe this specific type of chord. The term originated from classical music theory, where the word “augmented” comes from the Latin “augmentare,” meaning “to increase,” referring to the raised fifth.
Construction and Notation of Augmented Chords
Constructing an augmented chord involves a straightforward process:
- Start with a major triad (root, major third, perfect fifth).
- Raise the perfect fifth by a semitone to create the augmented fifth.
In notation, augmented chords are typically written as:
- Root note followed by “aug” (e.g., Caug)
- Root note followed by a plus sign (e.g., C+)
For example, the augmented chord built on D would be written as Daug or D+. Its notes are D, F#, and A# (or Bb, depending on context).
Augmented chords are often used in various musical styles, including classical, jazz, and pop, to create a sense of anticipation or to add color to harmonic progressions. Their symmetrical structure also makes them useful in modulation and voice-leading techniques.
Usage and Examples in Music
Augmented chords serve multiple functions in music:
- Creating Tension: Due to their dissonant sound, augmented chords generate a feeling of suspense that often resolves to more stable chords like the tonic or major/minor chords.
- Color and Brightness: Their shimmering sound adds brightness and a sense of otherworldliness, often used for expressive effect.
- Harmonic Pivot: They can act as passing or connecting chords, facilitating smooth modulation between keys.
For example, in classical music, composers like Beethoven and Wagner frequently used augmented chords to heighten emotional intensity. In jazz, augmented chords are often employed as passing chords or to add color in improvisation. In popular music, they might appear in chord progressions to add unexpected brightness or tension.
A common example can be found in the opening of Beethoven’s “Pathétique” Sonata (Op. 13), where an augmented chord creates a dramatic and tense atmosphere. In jazz, a common progression might be from a C major chord to a Caug, then resolving to a D minor, creating a chromatic movement that enriches the harmony.
It’s worth noting that many misconceptions surround augmented chords. Some believe they are only used for dramatic effect or that they always resolve to a specific chord. While they do create tension, their versatility allows for various expressive uses, including as a color tone within more complex chord voicings.
In summary, an augmented chord is a distinctive, harmonically rich chord that plays a vital role in creating tension, color, and movement within a piece of music. Its construction from a major triad with a raised fifth makes it easily recognizable, and its use across musical genres underscores its importance as a fundamental harmonic device.
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