Guitar Chord Families – How Chords Relate to Each Other

Whenever you’re trying to figure out a song by ear, or working on one of your compositions, harmony always plays a big part. 

The chords that exist in a progression directly relate to the melody, they imply a certain function or feeling, and there are explicit reasons as to why some chords sound good or seem to fit in a certain context.

This is where the concept of “chord families” comes in. It can also be called “harmonic field”, and can be often be discerned from reviewing a chord key chart.

This KillerGuitarRigs guide will go in-depth into this matter to teach you the most important aspects that you must understand and master if you want to become a more complete musician in general.

In order to fully comprehend every section of the guide, you should be familiarized with some concepts, such as what is a major scale, common chord qualities (major, minor, diminished), relative major/minor keys, and modes.

Want to learn more about music theory?
Check out our ultimate guide to music theory to find more jumping off points.

Chord Families: What kinds of chords exist in a key, and how are they represented?

When we talk about “chord families”, we are implying a group of chords that naturally occur in a given key. The interval between a chord and the key to which it belongs dictates its harmonic function.

Some chords “feel” like home, some of them make you feel like you’re moving away from it, and others create tension that almost asks to be resolved afterward. Knowing which chords sound the way you want can help you compose better songs.

Let’s use the key of C Major to start. Since it has no accidentals (sharps or flats) it is the most commonly used key to demonstrate harmonic concepts.

The C Major scale has the following notes:

  • C (Root)
  • D (Major Second)
  • E (Major Third)
  • F (Perfect Fourth)
  • G (Perfect Fifth)
  • A (Major Sixth)
  • B (Major Seventh)
Guitar Chord Families - The C Major

C Major’s chord family contains the following chords:

Guitar Chord Families - C Major’s chord family

Notice that there are different types of chords – major, minor and diminished. An important feature of chord families is that they follow the same pattern, regardless of the key center.

You should also get used to seeing chords represented by Roman numerals. “I” is the root or key center, “II” is the second degree, and so on.

Minor chords are sometimes represented by lowercase numerals, but if they are represented by uppercase characters, they are still minor.

Harmonic Field and Chord Qualities

The chord family of a Major key always respects this pattern:

  • Degrees I, IV and V are Major;
  • Degrees II, III and VI are minor;
  • Degree VII is diminished.

If you use 7th chords (4 note chords instead), the pattern is as follows:

  • Degrees I and IV are Maj7,
  • Degrees II, III and VI are min7,
  • Degree V is dominant/7,
  • Degree VII is half diminished/m7b5

This is one of the most important naturally occurring patterns to memorize in harmony

Knowing how to apply it to any key center means that you will automatically know which chords are more likely to be used in a song that you’re learning.

For example, if you’re learning a song in the key of C Major, you should immediately realize that these are the chords that make the most sense to use:

  • C Major / CMaj7
  • D minor / Dmin7
  • E minor / Emin7
  • F Major / FMaj7
  • G Major / G7
  • A minor / Amin7
  • B diminished / Bm7b5

Major Keys Chart

The following chart illustrates which chords belong to the chord family of every major key. Use it for future reference and while practicing figuring out the harmonic field of random keys.

KeyIiiiiiIVVvivii
C MajorC MajorD minorE minorF MajorG MajorA minorB diminished
Db MajorDb MajorEb minorF minorGb MajorAb MajorBb minorC diminished
D MajorD MajorE minorF# minorG MajorA MajorB minorC# diminished
Eb MajorEb MajorF minorG minorAb MajorBb MajorC minorD diminished
E MajorE MajorF# minorG# minorA MajorB MajorC# minorD# diminished
F MajorF MajorG minorA minorBb MajorC MajorD minorE diminished
F# MajorF# MajorG# minorA# minorB MajorC# MajorD# minorE# diminished(= F#)
G MajorG MajorA minorB minorC MajorD MajorE minorF# diminished
Ab MajorAb MajorBb minorC minorDb MajorEb MajorF minorG diminished
A MajorA MajorB minorC# minorD MajorE MajorF# minorG# diminished
Bb MajorBb MajorC minorD minorEb MajorF MajorG minorA diminished 
B MajorB MajorC# minorD# minorE MajorF# MajorG# minorA# diminished

Minor Keys Chart

This chart fulfills the same purpose as the last one, but it represents minor keys instead.

Notice how each key center uses the same set of chords as its relative major key, but is centered on a different tonic (I chord).

KeyiiiIIIivvVIVII
A minorA minorB diminishedC MajorD minorE minorF MajorG Major
Bb minorBb minorC diminishedDb MajorEb minorF minorGb MajorAb Major
B minorB minorC# diminishedD MajorE minorF# minorG MajorA Major
C minorC minorD diminishedEb MajorF minorG minorAb MajorBb Major
C# minorC# minorD# diminishedE MajorF# minorG# minorA MajorB Major
D minorD minorE diminishedF MajorG minorA minorBb MajorC Major
Eb minorEb minorE# diminishedF# MajorG# minorA# minorB MajorC# Major
E minorE minorF# diminishedG MajorA minorB minorC MajorD Major
F minorF minorG diminishedAb MajorBb minorC minorDb MajorEb Major
F# minorF# minorG# diminishedA MajorB minorC# minorD MajorE Major
G minorG minorA diminished Bb MajorC minorD minorEb MajorF Major
G# minorG# minorA# diminishedB MajorC# minorD# minorE MajorF# Major

Relative Major and Minor Keys – Overview and How to Apply in a Harmonic Context

The concept of relative keys/scales is simple. Two scales share the same set of notes: one is major, the other is minor, and their root note is different.

Every major scale/key has a relative minor, and vice-versa.

You can find the relative minor of a major key by moving up a major sixth or down a major third.

For instance, C Major is the relative major scale of A minor (A is a major sixth away from C).

C Major is made up of the following notes: C, D, E, F, G, A, B.

A minor on the other hand looks like this: A, B, C, D, E, F, G.

Being able to quickly identify relative scales and keys will allow you to locate yourself much better when playing patterns on the guitar. (Read our full guide to scales here).

The following table shows you the relative major and minor scales you should know.

Major KeyRelative Minor Key
C MajorA minor
D MajorB minor
E MajorC# minor
F MajorD minor
G MajorE minor
A MajorF# minor
B MajorG# minor
Db MajorBb minor
Eb MajorC minor
Gb MajorEb minor
Ab MajorF minor
Bb MajorG minor

This relationship is often represented on the Circle of Fifths, an essential tool to understand how every key centers work.


What is the function of each chord in a key?

The chords of a given harmonic field can be grouped according to their “harmonic function”. This is a category that tells us what kind of role that chord has in that tonality.

For this example, we will use the key of C Major, and 7th chords instead of triads. We have 3 different types of harmonic functions:

  • Tonic Chords
  • Subdominant Chords
  • Dominant Chords

Tonic chords sound like “home”. They establish a sense of root and tonality in a song, which is why songs frequently start or finish songs. The chord family of any key has the following tonic degrees:

  • iii 
  • vi 

None of these chords will have the 4th degree of the scale (in C Major, the 4th degree is F).

Subdominant chords are used to transmit a sensation of moving away from the key center’s feeling of “home”. These are frequently used to help create tension (used before a dominant chord). The following chord degrees are subdominant:

  • ii 
  • IV 

In contrast to the tonic chords, these contain the 4th degree of the scale.

Dominant chords are used to create tension in music. They sound unstable, quite unlike tonic chords, and they almost literally “ask” to be resolved. These are the dominant degrees:

  • vii 

The main particularity about these chords is the fact that they have a tritone interval (diminished fifth) in them. 

Harmonic Functions in Common Chord Progressions

Let’s put this into practice by looking at some of the most common cadences in western music. There are countless songs that feature these chord progressions – sometimes they make up the entire song.

You’ll notice that in many cases, dominant chords move towards tonic chords, and subdominant move toward dominant chords. However, this is not a rule, and you can mix and max every chord the way you see fit.

CadenceHarmonic Functions
ii – V – ISubdominant – Dominant – Tonic
I – vi – ii – VTonic – Tonic – Subdominant – Dominant
I – IV – VTonic – Subdominant – Dominant
I – V – vi – IV  Tonic – Dominant – Tonic – Subdominant
I – IV – VI – VTonic – Subdominant – Tonic – Dominant

Being able to quickly identify the function of each chord in a key can help you be more creative by being aware of potential chord substitutions and having a better sense of how music generally works.


The Concept of Chord Families Applied to the Modes

We can apply the same concept to the modes of the major scale and obtain even more chord families.

If you’re already familiarized with how modes work, you just need to reapply the same logic to chord degrees instead of the notes of a scale.

Let’s look into a few practical examples to make this clearer. 

For the purpose of demonstrating this concept, we will use the chord families that come from the modes of the C Major scale (C Ionian, D Dorian, E Phrygian, F Lydian, G Mixolydian, A Aeolian and B Locrian).

Ionian

The Ionian mode is the same as the major scale, so there isn’t more to be said about it other than what is explained in the previous sections. 

The C Major chord family looks like this on the staff:

Guitar Chord Families - Ionian

Dorian

The Dorian mode has the following formula: 1, 2, b3, 4, 5, 6, b7

Dorian chord families follow the structure shown below:

  • i – Minor 7
  • ii – Minor 7 
  • bIII – Major 7 
  • IV – Dominant 7
  • v – Minor 7 
  • vi – Half Diminished
  • bVI – Major 7 

Here is the corresponding chord family if we are in the key of D Dorian:

Guitar Chord Families - Dorian

Phrygian

Phrygian can be represented by the following formula: 1, b2, b3, 4, 5, b6, b7.

A Phrygian chord family will look like this:

  • i
  • bII
  • bIII
  • iv
  • v
  • bVI
  • bvii

In the key of E Phrygian, this is the harmonic field on the staff:

Guitar Chord Families - Phrygian

Lydian

The Lydian mode follows this formula: 1, 2, 3, #4, 5, 6, 7.

The corresponding chord families follow this structure:

  • I
  • II
  • iii
  • #iv
  • V
  • vi
  • vii

Here are the chords of the F Lydian family written on a staff:

Guitar Chord Families - Lydian

Mixolydian

The Mixolydian mode can be represented by the following formula: 1, 2, 3, 4, 5, 6, b7.

Its chord families all follow this pattern:

  • I
  • ii
  • iii
  • IV
  • v
  • vi
  • bVII

Here’s what this chord family looks like in G Mixolydian:

Guitar Chord Families - Mixolydian

Aeolian

As you probably already know, the Aeolian mode corresponds to the natural minor scale. The corresponding formula is: 1, 2, b3, 4, 5, b6, b7.

Its chord family has the following structure:

  • i
  • ii
  • bIII
  • iv
  • v
  • bVI
  • bVII

Here are the chords that belong to the family of A Aeolian:

Guitar Chord Families - Aeolian

Locrian

Lastly, the Locrian mode follows this formula: 1, b2, b3, 4, b5, b6, b7.

Locrian chord families follow the pattern below:

  • i
  • bII
  • biii
  • iv
  • bV
  • bVI
  • bvii

Here is how you would write the B Locrian chord family on a staff:

Guitar Chord Families - Locrian

Final Thoughts About Guitar Chord Families

As a guitarist and musician in general, it pays off big time to be familiarized with every key’s chord family, or harmonic field. Once you’re past beginner chords (whether learning yourself or learning online), cord families should be your first step into learning theory.

Knowing which chords exist in each key and the function that they have is crucial to writing songs that make sense and express the feelings that you want to convey through the song’s harmony.

Gustavo Pereira

Gustavo is a Portuguese musician based in Barcelona, where he’s studying jazz & modern music interpretation on the electric guitar. Favorite genre: blues, jazz, funk, soul

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