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Home > Progressions > Relative Key

Using Relative Key Changes to Make More Interesting Music

As a songwriter, key changes are a really effective way of making your songs sound structurally and dynamically more interesting.

As a lead player, being able to recognise when key changes occur will help you choose the right scales/notes for your solo.

This lesson will introduce you to the mechanics of key changes (often called modulation) starting with the most natural sounding type of modulation - changing between relative keys. This is a good place to start because, as we'll discover, both these keys share the same scale notes.

Watch the presentation below for the basic info, with more help further down the page...




Relative Key Chart and Diagrams

First, we need to understand the relationship between relative major and minor chords.

Relative major/minor chords are always a minor 3rd interval (whole + half step) apart, with the minor chord below the major. That's the equivalent of 3 frets on the fretboard. So we have:  min - W H - Maj

So to get from a minor chord to its relative major, you move up a minor 3rd interval from its root.

To get from a major chord to its relative minor, you move down a whole and half step from its root.

The table below shows this relative relationship in several keys.

Major Cmaj Dmaj Emaj Fmaj Gmaj Amaj Bmaj
Minor Am Bm C#m Dm Em F#m Abm

The diagram below shows you the relationship between relative major (M) and minor (m) chord root notes on the fretboard. So wherever the root of your chord shape is on the neck, you should be able to find its relative chord in close proximity...

relative major and minor chord root positions

But why "relative"? (Warning: for the theory heads only!)

This isn't so important to know if you're not that interested in theory, but in the context of key, relative major and minor keys are said to share the same key signature. The only difference between the two is they represent a different tonal centre, i.e. they act as independent tonic chords of their own keys.

Remember that key signature is not the same as key centre. Key signature is about specific notes used in the chords/scale of the progression. Key centre is about where the progression resolves in that scale... which chord is used as "home". The two strongest and most commonly used home (tonic) chords are the relative major and minor chords.

Both Cmaj and Am, for example, share the same key signature (since they share notes from one key signature). But if you built a progression around a Cmaj tonic, for example, it would have a different key centre to a progression built around an Am tonic. They both act as independent points of resolution even though they share notes from the same scale (C major or A natural minor).

Anyway, what matters is that you can visualise and hear the relationship between relative major and minor chords. Then, we can move on to using/identifying them in progressions.


Changing Between Relative Major and Minor Keys

The only difference between a relative major and minor key is we're resolving the progression to a different chord in the same scale - I (1) for the major tonic and vi (6) for the minor tonic.

Here's how the scale would look in C major...

C diatonic chord scale

So we could have a progression of: Cmaj / Fmaj / Dm / Gmaj (I  IV  ii  V) ...and Gmaj would resolve nicely back to Cmaj. Cmaj is therefore the tonic I or "home" of this progression. There's a certain musical "gravity" that pulls us towards it.

That, in a nutshell, is what key centre is all about. No need to overcomplicate it. It's all about resolution.

However, we could also resolve from Gmaj to the relative minor key of Am, Am being the vi chord of the harmonized C major scale.

Technically, when we establish a new tonic like this, we should call that new tonic chord 1 or i (lower case numeral for minor chords). But that would mean renumbering the scale in relation to that new 1 chord. I prefer to just see the relaitve minor tonic as the 6 chord of the major scale.

Use pre-tonic chords for smoother transition

Pre-tonic (Pt) chords are chords that come just before the tonic with their main function being to aid resolution (think of them like signposts that tell you you're almost home!). Some chords create a stronger pull to a tonic than others and can help us transition smoothly between keys.

When changing between relative keys, pre-tonic chords are only really something to think about when changing to the major key. Why? Because strangely enough, minor keys don't rely so much on a strong pre-tonic. It's often said that minor keys are more flexible than major keys. You could use any chord from the scale above, before resolving to vi, and it would sound smooth. It's major keys that benefit the most from a strong pre-tonic. I wish I could explain why that is, but I just put it down to the "nature" of music (yes, that was a copout!).

charts showing pre-tonic chords between relative keys

Examples of relative key modulation

Below are some examples (with audio clips) of major I - minor vi key changes using typical progressions you'll hear in countless songs old and new. I've also highlighted the "pre-tonic" (Pt) chord...

In the audio clips you'll hear the minor progression played twice before changing to the relative major key, again played twice before resolving back to the minor tonic. This will demonstrate how this relative key shift works in practice.

Minor Key Pt Major Key Audio
Am Fmaj Gmaj Cmaj Fmaj Gmaj Click here
Em Cmaj Am Gmaj Cmaj Am Click here
F#m Bm Dmaj Amaj Bm Dmaj Click here

Note: you obviously don't have to repeat the same progression in the major key as you did in minor. I've just used the same chords to demonstrate how they can still sound natural when a relative key change is used.

Progressions also don't always start on the tonic. However, when getting to know this stuff, starting on the tonic will help train your ear to a specific key centre.

Bridge tonicization

Don't be fooled by the jargon! Tonicization is just another way of saying "a temporary change in key/tonic".

So we might change from a major key verse to a relative minor bridge (e.g. for just four measures) and then return to the relative major key for the chorus. This is a technique commonly employed in popular music and helps to structurally and dynamically break up the song.

Examples...

Verse Bridge Chorus Audio
Cmaj Dm Gmaj Am Em Fmaj Gmaj Cmaj Click here
Gmaj Dmaj Cmaj Am Em Am Cmaj Gmaj Click here

Note: that second example demonstrates how we don't have to start on the tonic chord to affirm the new key centre.

Other ideas to try

Use relative modulation to... The main thing is that you have fun experimenting with different ways in which you can use this technique. As a songwriter, it'll encourage you to think more creatively. As a soloist, it'll prepare you for playing through key changes.


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