A#6/9 Piano Chord

Piano Diagram of A#6/9 in Root Position

A#6/9 is a five-note chord consisting of the notes A#, C_x, E#, F_x, and B#. It is a major chord with an added 6th and 9th. It belongs to the chord family of 6th chords, which are “Added chords”. Keep reading to gain a deeper understanding of the music theory behind this chord.

 

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Playing Extended Chords on Piano

Extended chords are an essential part of piano playing, providing a rich and complex sound. However, playing extended chords can be challenging due to the number of notes involved. One way to manage this is by omitting certain notes, such as the root or the 5th, or by dividing the chord between both hands.

Despite these techniques, extended chords can still create dense harmonies that require careful voicing. When inverted, these chords can produce complex clusters of notes that need to be approached with skill and precision. Mastering the voicing of extended chords takes time and practice, but it’s a crucial skill for any pianist looking to expand their repertoire.

 

A#6/9 Chord Inversions

The A#6/9 chord has a total of 4 inversions:

 

Piano Keyboard Diagrams

 

Chord Inversion on Piano

Chord inversions are a foundational concept in music theory, helping to explain how chords are built and how they fit into progressions. However, when we talk about chord inversions on a piano keyboard, it’s important to keep in mind that the diagrams we use to show the notes in an inversion might not always match up with practical playing.

In practice, pianists use different voicings and fingerings for chords, spreading the notes out across different octaves and positions on the keyboard. This means that the basic shape of a chord’s inversions as shown in diagrams might not always be the most efficient way to play the chord on a piano keyboard.

So while chord inversion diagrams can help understand the sequence of notes in a chord, they don’t always give us the best way to play the chord on a piano. It’s up to each pianist to experiment with different voicings and find the most comfortable and efficient way to play the chord while still maintaining the intended harmonic function and sound.

 

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Music Theory and Harmony of A#6/9

 

Building the A#6/9 Chord: Different Approaches

Starting from the A# Major Scale

To create a 6/9 chord, you can use the Major scale as a reference by combining a Root, a 3rd, a 5th, a 6th, and a 9th.

In this case, to build an A#6/9 let’s start from the A# Major scale:

 

 

 

Apply the formula R, 3, 5, 6, 9 to get an A#6/9 chord:

1. Select the Root note, which is A#.
2. Pick the 3rd note, which is C_x (“C double sharp”, equivalent to a natural D), and add it to the chord.
3. Add the 5th note, which is E# (F), and include it as well.
4. Now, add the 6th which is F_x (equivalent to a natural G).
5. Lastly, include the 9th note of the A# Major scale, which is a B# (C).

 

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by Combining Intervals

To build a 6/9 chord, one approach is to combine specific intervals, namely a major 3rd, a minor 3rd, a major 2nd (whole-tone), and a major 3rd.

3 + m3 + 2  + 3 = 6/9 Chords

When constructing an A#6/9 chord, you can see that

• A#-C_x forms a major 3rd,
• C_x-E# creates a minor 3rd,
• E#-F_x makes a whole-tone interval, and
• G#-B# is a major 3rd.

Stacking these intervals together creates an A#6/9 chord.

 

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How to Use A# 6/9 in a Chord Progression

 

Since 6/9th chords are based on major triads with a sixth and a ninth added, they can substitute the major chords built on the scale of the root. This means that we can use the A#6/9 chord in those positions on the scale where the harmonization makes a major chord.

In some cases, a 6/9 chord can be used as a dominant chord, but it is less common than its use as a tonic or subdominant chord.

The following tables illustrate the harmonization of scales that contain an A# Maj7 or an A#7 chord.

on Major Scales

In this case, the A# Maj7 or A#7 chords are found solely in theoretical major keys. Consequently, it is more practical to reference their enharmonic equivalent keys.

• Tonic chord in Bb Major as Bb6/9
• Subdominant chord in F Major as Bb6/9
• Dominant chord in Eb Major as Bb6/9 (less common)

on Natural minor Scales

As before, we will refer to the equivalent keys as the A# Maj7 or A#7 chords are present exclusively in theoretical minor keys.

• Mediant chord in G minor as Bb6/9
• Submediant chord in D minor as Bb6/9
• Dominant chord in C minor as Bb6/9 (less common)

 

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A#6/9 in A# Major

Check Bb6/9 in Bb Major

 

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A#6/9 in E# Major

Check Bb6/9 in F Major

 

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A#6/9 Chord in D# Major

Check Bb6/9 in Eb Major

 

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A#6/9 in F_x minor

Check Bb6/9 in G minor

 

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A#6/9 in C_x minor

Check Bb6/9 in D minor

 

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A#6/9 in B# minor

Check Bb6/9 in C minor

 

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Alternative Names for A#6/9

• A# 6/9
• A# 6(9)
• La# 6/9
• A# 6/9th
• A# add6/9

 

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