What is the Dominant Chord of bVII?
When we talk about music theory, we often hear terms like "dominant chord" and "tonic chord." These are fundamental building blocks that create tension and release in songs. Usually, when we refer to the dominant chord, we mean the V chord in a given key. For instance, in the key of C major, the dominant chord is G major. This chord has a strong pull back to the tonic (C major).
However, the question, "What is the dominant chord of bVII?" delves into a less common, yet fascinating, area of harmony. The "bVII" refers to the chord built on the flattened seventh scale degree of a key. In C major, the seventh scale degree is B. Flattening it gives us Bb. So, the bVII chord in C major is Bb major.
Here's where it gets interesting: the concept of a "dominant chord of bVII" isn't a standard, universally recognized term in traditional Western music theory. Unlike the dominant of the tonic (V of I), or even the dominant of the dominant (V of V), the dominant of the bVII chord doesn't have a fixed, predefined function that all musicians automatically understand.
So, What Does It Mean to Have a "Dominant Chord of bVII"?
When someone asks about the "dominant chord of bVII," they are likely exploring how to create a similar sense of harmonic pull towards the bVII chord as a dominant chord typically has towards the tonic.
In music theory, a dominant chord is typically a major triad or a dominant seventh chord. The dominant seventh chord, in particular, is characterized by the tritone interval between its third and seventh, which creates a strong dissonance that wants to resolve.
Building the Dominant of bVII
To find the "dominant of bVII," we need to go up a perfect fifth from the root of the bVII chord. Let's stick with our example in C major, where our bVII chord is Bb major.
To find the dominant of Bb, we go up a perfect fifth from Bb. A perfect fifth above Bb is F.
Therefore, the dominant chord of Bb major is F major.
If we are talking about a dominant seventh chord, then the dominant seventh chord of Bb major would be F7. This F7 chord consists of the notes F, A, C, and Eb.
Why Would We Want a "Dominant of bVII"?
The bVII chord is often used in popular music, particularly in rock, pop, and blues. It's a common chord in what's sometimes called "modal interchange" or "borrowed chords," where chords are borrowed from parallel keys. In C major, the Bb major chord is borrowed from C minor.
Using the dominant of the bVII (F or F7 in our C major example) can create a smoother or more intentional transition into the bVII chord. Instead of the bVII chord appearing somewhat out of the blue, having its dominant precede it adds a sense of harmonic expectation.
Here's how it might function:
- In the key of C major: The progression could be C - G - F7 - Bb. Here, the F7 (the dominant of Bb) leads strongly to Bb.
- Alternatively, it could be used in a sequence: C - G - Am - F7 - Bb.
This F7 chord creates tension that resolves into the Bb major chord, much like a G7 chord would resolve into a C major chord in a more traditional progression.
The Role of Tritones
The power of a dominant seventh chord comes from the tritone (an interval of three whole steps) between its third and seventh. In F7 (F, A, C, Eb), the tritone is between A and Eb. This interval has a strong tendency to resolve:
- The A wants to resolve up to Bb (the third of Bb major).
- The Eb wants to resolve down to D (the fifth of Bb major).
This tendency is what gives the F7 chord its strong pull towards Bb major.
Context is Key
While "dominant of bVII" isn't a term you'll find in every music theory textbook, understanding how to construct it helps musicians analyze and create more sophisticated harmonic progressions. It's about recognizing that any chord can theoretically have a dominant chord that leads to it, even if that chord isn't the primary tonic of the piece.
In essence, when you ask "What is the dominant chord of bVII?", you're asking for the chord that would traditionally lead into the bVII chord using the familiar dominant-tonic relationship. This is achieved by identifying the note that is a perfect fifth above the root of the bVII chord and building a major or dominant seventh chord on that note.
FAQ Section
How do I find the dominant chord of bVII in any key?
To find the dominant chord of bVII in any key, first identify the root of the bVII chord. Then, move up a perfect fifth from that root note. Build a major triad or a dominant seventh chord on that note. For example, in the key of G major, the bVII chord is F major. A perfect fifth above F is C. Therefore, the dominant of F is C major, and the dominant seventh is C7.
Why is the bVII chord used so often in popular music?
The bVII chord is popular because it often creates a sense of lift, energy, and a departure from the expected. It's a common chord borrowed from the parallel minor key, offering a different harmonic flavor. It also provides a stepping stone to other chords, and when used with its dominant, it can create a strong harmonic movement.
Is the "dominant of bVII" always a major or dominant seventh chord?
In the context of discussing "dominant function," yes, it's typically understood to be a major triad or a dominant seventh chord because these chord types are characterized by their inherent tension and desire to resolve to a tonic. However, in some experimental or jazz contexts, other chord types might be used to lead into the bVII chord, but they wouldn't be strictly called its "dominant."
Does the dominant of bVII have a specific name or function?
While we can construct it and understand its function as leading to the bVII, it doesn't have a unique, universally adopted technical name or assigned Roman numeral function in the same way that the V chord (dominant of the tonic) does. Its function is derived from its relationship to the bVII chord, which itself is often considered a borrowed or modal chord.
