Gbm6 Piano Chord

Piano Diagram of Gbm6 in Root Position

The Gbm6 is a chord made up of four notes Gb, Bbb, Db, and Eb. It’s the minor chord built on the key of Gb with an added major 6th interval (Eb). It belongs to the chord family of “added tone chords” (aka “add chord”) because it has an extra tone added to a minor triad. In this article, we’ll take a closer look at the music theory behind this chord.

 

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Finger Position

 

Gbm6 Chord Inversions

The Gbm6 chord has a total of 3 inversions:

Piano Keyboard Diagrams

 

Gbm6 Chord Equivalencies

Rearranging the notes of a chord can lead to interesting and unique chord equivalencies. This is especially true for 6th chords, as we can create a different type of chord by rearranging the notes of a minor 6th chord in a specific way.

If we take the 3rd inversion of a minor 6th chord, where the 6th note becomes the root note, we end up with a minor 7th flat 5th chord (also known as a half-diminished chord).

For example, let’s take the Gbm6 chord, which consists of the notes Gb, Bbb, Db, and Eb. By rearranging the notes so that Eb becomes the root note, we get an Ebm7b5 chord with the notes Eb, Gb, Bbb, and Db.

3rd Inversion of Gbm6 = Ebm7b5

The reason why the 3rd inversion of a minor 6th chord results in a minor 7th flat 5th chord is due to the note relationships between the chords. When we move the 6th note to become the root note, we end up with a chord that has a minor 3rd, diminished 5th, and a minor 7th interval. These intervals are the same as a m7b5 chord.

Also, note that the 3rd inversion of a minor 6th chord is a dominant 9th chord without root. Gbm6 3rd inversion is Eb, Gb, Bbb, Db which could be considered also a B9 (B, Eb, Gb, Bbb, Db) without the root.

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Music Theory and Harmony of Gbm6

A Gb minor 6th chord consists of four notes, a Gb minor triad, plus a 6th interval. Due to the inclusion of the major sixth interval, represented by the note Eb, the Gb minor 6th chord generates a sense of tension that can either be resolved by transitioning to a more stable chord or utilized to create a feeling of “uncertain stability.”

 

Building the Gbm6 Chord: Different Approaches

Starting from the Gb Major Scale

To build a minor 6th chord, you would include the root note, minor third, fifth, and sixth from a minor scale.

However, when teaching this concept, it can be more effective to demonstrate its construction using a major scale. This is because a major scale better illustrates the relationship between intervals and their respective qualities.

For instance, to build the Gbm6 chord, you can start with the Gb Major scale:

 

 

 

To create a Gbm6 chord, apply the formula R, m3, 5, 6 in the following manner:

1. Begin with the Root note, Gb.
2. Select the 3rd interval Bb then lower it down by a half-tone to get the minor 3rd, Bbb (which is equivalent to a natural A).
3. Include the 5th note, which is Db, to the chord.
4. Finally, add the 6th interval, Eb.

By following this simple formula, you can create a minor 6th chord from any major scale.

 

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by Combining Intervals

One method to create a minor 6th chord is by combining specific intervals – a minor 3rd, a major 3rd, and a major 2nd (a whole-tone).

m3 + 3 + 2 = minor 6th Chords

To illustrate, let’s use the Gbm6 chord as an example: by examining the intervals between the notes, we can see that

• Gb-Bbb is a minor 3rd interval,
• Bbb-Db is a major 3rd interval,
• and Db-Eb is a whole-tone interval.

These three intervals can be stacked together to create the Gbm6 chord.

 

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How to Use Gbm6 in a Chord Progression

 

A minor 6th chords can be used as a variation of a minor chords. However, it’s important to understand that the major 6th interval present in this chord may not always be a part of the scale being used.

Since Gb minor chords are found only in theoretical keys, we will refer to their enharmonic equivalent chords.

on Natural minor Scales

• Non-diatonic Tonic chord in F# minor as F#m6
• Subdominant chord in C# minor as F#m6
• Non-diatonic Dominant chord in B minor as F#m6

on Major Scales

• Supertonic chord in E Major as F#m6
• Non-diatonic Mediant chord in D Major as F#m6
• Non-diatonic Submediant chord in A Major as F#m6

 

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Gbm6 in Gb minor (Non-Diatonic)

Check F#m6 in F# minor

 

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Gbm6 in Db minor

Check F#m6 in C# minor

 

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Gbm6 in Cb minor (Non-Diatonic)

Check F#m6 in B minor

 

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Gbm6 in Fb Major

Check F#m6 in E Major

 

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Gbm6 in Ebb Major (Non-Diatonic)

Check F#m6 in D Major

 

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Gbm6 in Bbb Major (Non-Diatonic)

Check F#m6 in A Major

 

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Alternative Nomenclature for Gbm6

• Gb -6
• Solb -6
• Solb m6
• Gb m6th
• Gb min6
• Solb min6
• Gb m(add6)
• Gb min add 6
• Gb minor 6th
• Gb minor sixth