Bb aug Piano Chord

Piano Diagram of Bb aug in Root Position

A Bb augmented chord is an augmented triad built upon the key of Bb. To get a Bb augmented chord, you combine the root (Bb), the major 3rd (D), and the “augmented” 5th note (F#) from the Bb scale. Keep reading to get a better grip on the music theory behind this chord.

 

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Bb aug Chord Inversions

 

Bb aug has a total of 2 inversions:

Piano Keyboard Diagrams

Inversions Equivalencies

One interesting feature of augmented chords is that each inversion of the chord produces a different augmented chord. For example, if you take the first inversion of a Bb augmented chord, you get a D augmented chord. And if you take the second inversion of a Bb augmented chord, you get an F# augmented chord.

So, you only really need four different augmented chords to cover all the possible keys, because all the other augmented chords can be found by inverting these four chords.

 

 

Notice how each of the four distinct augmented chords contains a unique combination of three notes, which can be rearranged into three different chord inversions. By utilizing these four chords and their inversions, it’s possible to cover all 12 keys. Keep in mind that the selection of C, C#, D, and D# is arbitrary, as you could use any other series of unique augmented chords to build them all.

 

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Music Theory and Harmony of Bb aug

 

Augmented chords are typically found on the third degree of both the melodic and harmonic minor scales, where they are intended to function as mediant chords.

G Melodic Minor Scale

G Harmonic Minor Scale

 

However, in practice, they are not commonly used in this way. Instead, augmented chords are often used as a leading tone to resolve to a major or minor tonic chord.

But before we explore the chords that can follow a Bb augmented chord, let’s take a closer look at how to build it.

 

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Building the Bb aug Chord: Different Approaches

 

Starting from the Bb Major Scale

Keeping as reference the major scale, build the augmented chord, which consists of the Root, major 3rd, and sharp 5th.

 

 

 

• Start from the root note Bb.
• Add the major 3rd D.
• Raise the 5th note, F by one half-step to get F#.
• Combine the root note Bb, the major 3rd D, and the augmented 5th F# to form the Bb augmented chord.

You can apply the formula R, 3, #5 to build any augmented chord.

 

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by Combining 3rds

An augmented triad is a chord consisting of two stacked major 3rds.

3 + 3 = aug Chords

To build an augmented triad on Bb, you would start from the root note Bb. Next, you would add a major third interval above Bb to obtain the note D. Finally, you would add another major third interval above D to get the note F#.

The resulting Bb augmented triad would consist of the notes Bb, D, and F#.

 

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How to Use Bb aug in a Chord Progression

 

Augmented chords can be used in different ways. One of the most common ways they’re used is through substitution, which means they can take the place of other chords. For example, augmented chords can be used as a substitute for dominant 7th chords. Additionally, they can also work as passing or transitional chords between other chords.

Most of the time, an augmented triad functions as a variation of the dominant chord that resolves on a tonic chord five degrees under its root. However it worth mentioning all easy transitions possible starting from a Bb aug. The harmonic structure of augmented chords makes possible to get many different chords just by shifting any of its notes by a half step, let’s see why:

 

Resolving Bb aug to Major and minor Chords

An augmented chord is made up of notes that are separated by a specific and constant distance from one another. In the case of a Bb augmented chord, the notes Bb, D, and F# are separated by a “major 3rd” interval.

It’s important to note that each note in the Bb augmented chord can act as a leading tone to transition to another chord that sounds good in the progression. This is because changing one of the notes in the augmented chord can create a different type of chord altogether.

To form a major chord, you need to combine a “major 3rd” interval with a “minor 3rd” interval. Conversely, a minor chord is formed by using a “minor 3rd” interval followed by a “major 3rd” interval. Therefore, when you play an augmented chord, you can use each note in the chord to lead to a different type of chord, such as a major or minor chord, by changing the distance between the notes.

 

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Lowering One Note: from Bb aug to Major Chords

The table below shows how lowering each note of the Bb aug chord can lead to three different major chords:

 

 

If you lower one note in the Bb augmented chord, you will end up creating a major chord from each of its notes. So Bb aug can transform into:

• Bb Major or
• D Major or
• F# Major

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Lowering Two Notes: from Bb aug to minor Chords

Lowering two notes of an aug chord results in several minor chords. Let’s explore which minor chords can be derived from the Bb aug:

 

 

Lowering two notes of an augmented chord creates three minor chords with the same root as the inversions of the augmented chord. This means that Bb aug can transform into:

• Bb minor or
• D minor or
• F# minor

This can be useful in minor keys where the v degree is played as a V7 chord (borrowed from the harmonic minor scale). In this case, the Bb augmented chord can replace Bb7, D7, and F#7 in minor keys.

However, the best fit for Bb augmented is to substitute Bb7. When it’s played in place of D7 or F#7, it’s actually an inversion of the better fit, D augmented and F# augmented, respectively.

 

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Raising One Note: from Bb aug to minor Chords

When you raise one note of a Bb aug chord, you get minor chords. The following table shows the three different minor chords that can be created from a Bb aug chord:

 

 

When we raise one note of a Bb augmented chord, we get:

• B (Cb) minor or
• D# (Eb) minor or
• F_x (G) minor

 

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Raising Two Notes: from Bb aug to Major Chords

Similarly, raising two notes of the Bb aug chord results in several major chords. Let’s take a look at which chords can be formed:

 

 

When we raise two notes of the Bb augmented chord, we can resolve it to three different chords:

• B (Cb) Major or
• D# (Eb) Major or
• F_x (G) Major

 

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Bb aug as Dominant Chord

As we have seen, Bb aug can be transformed into various minor and major chords simply by raising or lowering one or two notes. These tables show all the possible resolutions of the Bb augmented chord in major and minor keys, where it can be substituted for the V chord in a ii-V-I/i progression.

Try these progressions and experiment with playing both the augmented and the dominant chords, or just the augmented chord. You can also try playing the dominant chord first, followed by the augmented chord, or vice versa.

 

 

• When a Bb augmented chord resolves to an Eb major, it is functioning as the V+ (augmented fifth) degree in the key of Eb major. This is the most common use of the Bb augmented chord as a substitute for the Bb7 chord, which creates a strong sense of tension and resolution in the context of an Eb major key.
• In the keys of G major, Bb augmented can replace the V+ chord, which is D augmented. This is possible because Bb augmented is an inversion of D augmented that substitutes the D7 chord.
• Similarly, F# augmented, which is also an inversion of Bb augmented, can be substituted, but it’s usually better to use the augmented chord with the same root of the dominant chord instead of using an inversion.
• The tritone substitution: By replacing a dominant 7th chord with another chord whose root is a tritone away, we can create a new harmonic color while maintaining the original function of the dominant chord. In the case of Bb augmented it can be used as a tritone substitution for E7 because the distance between Bb and E is a tritone (six half steps).

 

The Bb augmented chord can serve as a substitute for the dominant 7th chord in minor keys. It is a common practice to use a dominant 7th chord instead of the minor dominant chord typically found in natural minor keys. This substitution is derived from the harmonic minor scale and is widely used in natural minor key progressions.

Since the Bb augmented chord shares the same notes as D augmented and F# augmented, and because augmented chords can substitute for the dominant 7th chords built on their roots, it follows that Bb augmented, being an inversion of both D augmented and F# augmented, can be used to replace D7 and F#7 in their respective keys. However, it’s better to play the augmented chord with the same root as the dominant chord rather than playing an inversion.

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Bb aug Voice Leading

Bb augmented can serve as a chromatic passing chord, allowing for smooth voice leading. It can also function as a pivot chord to modulate to a new key or be used as a substitute for the dominant chord to create a sense of tension and eventual resolution.

 

I I⁺ IV

 

I I⁺ iv

 

I I⁺ VI

 

I I⁺ ii V

 

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Bb aug as Chromatic Modulation

Using the Bb aug chord for chromatic modulation can add an interesting tonal color to your music. It is a popular technique used to add interest to a series of static measures on a single chord.

I  I⁺ I⁶ I⁺ I

 

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Alternative Names for Bb aug

• Bb+
• Bb+5
• Bbaug
• Bb(#5)
• Bb(5#)
• Bb(5+)
• Bbaug5
• Bb(5aug)

 

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