What Are Augmented Sixth Chords in Music Theory?

What Are Augmented Sixth Chords in Music Theory?

Posted on October 19, 2025 by Emmeline Pankhurst

Quick Answer

Augmented sixth chords are chromatic elements that inject excitement into Western classical music. They create tension before resolving to the dominant chord, much like a cliffhanger in a TV show. In essence, augmented sixth chords heighten tension and lead to a satisfying resolution.

As you delve into these chords, you’ll discover various types, each adding a distinct twist to the musical narrative.

What Are the Types of Augmented Sixth Chords?

Welcome to the enchanting realm of augmented sixth chords! Let’s explore the intriguing types that make this musical tool so captivating.

Each augmented sixth chord brings its own character, creating tension and drama that composers relish. They remind me of watching musicians discover how these chords can transform their playing.

Now, let’s explore how these chords have found their way into modern music, adding unique twists to contemporary tunes.

How Are Augmented Sixth Chords Used in Modern Music?

In the world of modern music, these charming augmented sixth chords have subtly woven themselves into contemporary compositions. While not always prominent in pop songs, their influence enriches many musical styles, adding a sophisticated edge.

In contemporary classical music, composers use augmented sixth chords to bridge old and new, crafting pieces that feel both timeless and innovative, much like pairing a vintage jacket with trendy sneakers. These chords create tension before an unexpected key change or add a splash of color to a minimalist texture, akin to sprinkling truffle salt on fries—transforming something familiar into something extraordinary.

In popular music, the presence of augmented sixth chords is subtle yet impactful. Their harmonic tension finds echoes in jazz, where dissonance and resolution enrich the genre. Similarly, in rock and blues, these chords heighten a song’s emotional impact, acting as the secret ingredient that gives a dish its unique flavor.

From my teaching experience, I’ve seen students’ eyes light up when they realize how even a hint of these chords can transform their compositions. It’s like unlocking a hidden feature on your favorite app—once discovered, you can’t imagine living without it. For musicians looking to explore chords and scales, Piano Companion, a versatile music theory app, offers similar insights, helping you discover and understand complex harmonic structures. Piano Companion is a music theory app for songwriters, producers, teachers, and students.

As we continue our exploration, we’ll delve into enharmonic spellings, illustrating the versatility and adaptability of these chords.

How Do Enharmonic Spellings Affect Augmented Sixth Chords?

Enharmonic spellings are like chameleons in the music world—they change appearance but remain fundamentally the same. In music theory, enharmonic equivalence refers to two notes that sound identical but are written differently, like calling someone “Mike” or “Michael.”

For augmented sixth chords, enharmonic spellings influence how we read and interpret them, adding flexibility and complexity to composition. An augmented sixth interval might appear as A♯ and F♮ or as B♭ and E♯. Though they sound the same, these differences can affect how a musician or composer perceives the chord’s role in harmony.

Enharmonic changes impact these chords in several ways:

  • Chord Function: The enharmonic spelling may alter the chord’s resolution, influencing whether it moves to a major or minor tonic, adding a creative twist to traditional resolutions.
  • Interpretation: Musicians might choose an enharmonic spelling to simplify reading or fit better with the surrounding harmonic context, much like selecting the right outfit for the occasion.

In my teaching, I’ve witnessed students’ “aha” moments when they grasp enharmonic equivalence. Suddenly, complex chord progressions become a playground of possibilities. It’s thrilling to watch them experiment with different spellings, discovering the emotional flavors each can introduce. For a deeper understanding of advanced harmonic concepts, including how augmented sixth chords can evolve from a predominant to a dominant function and their relationship to tritone substitution, you might find this detailed article on dominant-function augmented 6th chords insightful.

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Next, we explore how these chords serve in harmony, guiding us into the emotional landscape they create.

What is the Function of Augmented Sixth Chords in Harmony?

In suspense movies, that edge-of-your-seat feeling comes from waiting for resolution. Augmented sixth chords provide the soundtrack to that suspense, creating tension that demands a satisfying conclusion.

These chords are crucial in music, building tension that resolves to the dominant chord, like reaching the top of a rollercoaster before the exhilarating descent. This tension-and-release mechanism captures listeners, keeping them emotionally invested.

As dominant preparation, augmented sixth chords are ultimate sidekicks, setting the stage for the dominant chord. They often resolve to the dominant, which then resolves to the tonic, completing the musical journey. It’s akin to setting up a punchline in a joke, where the setup is as vital as the punchline.

Consider a piece by Mozart where an Italian augmented sixth appears before a climactic moment. The chord creates anticipation, making the resolution to the dominant chord the perfect payoff. This intricate dance between tension and resolution makes music a universal language of emotion.

Next, we’ll examine specific examples, demonstrating how these chords enhance musical storytelling.

Can You Provide Examples of Augmented Sixth Chords?

Ready to see these augmented sixth chords in action? Let’s dive into some notable compositions showcasing their dramatic flair.

Beethoven’s “Fidelio” offers a fantastic example. In this opera, the Italian augmented sixth chord adds tension before a pivotal resolution. It’s like watching a detective uncover the final clue—just when you think you know what’s happening, the music takes an unexpected turn, drawing you deeper into the narrative.

Another brilliant use is in Wagner’s “Tristan und Isolde”, where the German augmented sixth plays a crucial role in conveying the opera’s intense emotional depth. Wagner uses this chord to create nearly unbearable tension, resolving with such satisfaction that you might sigh in relief. His manipulation of these chords is a masterclass in musical storytelling.

Let’s break down a typical chord progression using augmented sixth chords. In a simple progression in C major:

  • C – F – G – C

Adding an Italian augmented sixth before the G transforms it:

  • C – F – Ab – C – F# (Italian Augmented Sixth) – G – C

This chord creates a sense of inevitability, pulling the music toward the G and making the return to C even more rewarding. It’s like adding a plot twist before resolution, keeping the audience on edge.

As we conclude this section, keep these examples in mind when listening to music or crafting your compositions. These chords are powerful tools for elevating musical storytelling, and understanding their use is key to appreciating their impact.

Key Takeaways

  • Augmented sixth chords come in three types: Italian, French, and German, each adding unique tension.
  • They play a pivotal role in creating suspense and resolution in Western classical music.
  • Recognize them by their distinctive interval: the augmented sixth.
  • Use them to enrich compositions, adding drama and guiding harmony toward resolution.
  • Experiment with their placement to transform simple progressions into captivating narratives.

Embrace these chords as tools of musical magic, unlocking endless possibilities in your compositions and performances.