Guitar Theory

What Scales to Play Over Chords

The right scale over a chord is not random. It follows directly from what notes are in the chord and what key the progression is in. Once you understand the connection, you will always know where to start.

The key principle

A scale works over a chord when the chord tones (the root, 3rd, and 5th) are all contained in the scale. The chord tones are the notes that define the chord's sound. If your scale includes all of them, you can land on any of them and it will sound intentional. If your scale is missing a chord tone, landing on it creates an unexpected clash.

This is why the major scale works over every chord in its key. Every diatonic chord is built from the scale's notes, so the chord tones are always in the scale. The scale and the chords share the same pool of notes.

Over a major chord

A major chord has a root, major 3rd, and perfect 5th. To play over it, use any scale that contains those three notes and matches the character of the music.

Major scaleAlways. All chord tones present. Full melodic range.G major scale over G major chord

Major pentatonicVery safe. Removes the two most tension-prone notes.G major pentatonic over G major chord

Natural minorWorks if the major chord is the VI or VII of a minor key.A natural minor over C or G chord

Minor pentatonicWorks in blues and rock contexts. The b3 creates a bluesy clash that is intentional.A minor pentatonic over A major chord (blues)

Over a minor chord

A minor chord has a root, minor 3rd, and perfect 5th. The minor 3rd is the defining note. It is what makes the chord dark. Your scale needs to contain that minor 3rd to match the chord's character.

Natural minorThe go-to choice. All minor chord tones present, full scale vocabulary.A natural minor over Am chord

Minor pentatonicThe most common choice. Forgiving and expressive, especially in rock and blues.A minor pentatonic over Am chord

Major scaleWorks when the minor chord is the ii, iii, or vi in a major key.C major scale over Am chord (vi of C major)

Over a full progression: one scale or many?

For most diatonic progressions (chords that all belong to the same key), you use one scale for the whole progression. If the chords are all in G major, play the G major scale over all of them. You do not switch scales at every chord change. You just shift which notes you emphasize.

The chord tones change on each chord, but the scale stays the same. When the Em chord arrives in a G major progression, you are still playing the G major scale. You are just emphasizing E, G, and B more heavily because those are Em's chord tones.

One scale (G major) over a full progression

GIG, B, DLand on G or B

EmviE, G, BLand on E or G

CIVC, E, GLand on C or E

DVD, F#, ALand on D or F#

When a chord is outside the key

Sometimes a chord appears that does not belong to the key. A B major chord in an A minor progression, or an F chord in a G major song. These are non-diatonic chords. The scale you have been using does not contain all their chord tones.

The approach here is not to switch scales entirely. Keep using your scale as the foundation. When the non-diatonic chord arrives, target its specific chord tones (root, 3rd, 5th) even if one of those notes falls outside your scale. Land on it, hold it briefly, and move off it as the chord changes away. One deliberate note outside the scale sounds like expression. Drifting through outside notes without intention sounds like a mistake.

A simple decision tree

Is the progression in a major key?

Use the major scale or major pentatonic of that key.

Is the progression in a minor key?

Use the natural minor scale or minor pentatonic of that key.

Is it a blues progression?

Start with the minor pentatonic. The blues scale (add b5) adds more grit.

Is there a chord outside the key?

Keep your scale, but target that chord's root and 3rd when it arrives.

Not sure what key it is in?

Find the chord the progression resolves to. That is your key center. See: How to Find the Key of a Song.

See the scale and chord tones together

Load any scale in the Scale Mapper and enable diatonic triads. See exactly which scale notes belong to each chord, mapped across the full neck at once.

Open Scale Mapper →