G Locrian Scale: Notes, Chords, and How to Play It

G Locrian is built on the 7th degree of A♭ major and delivers the characteristic Locrian instability — a diminished tonic triad, a flatted 2nd, and a flatted 5th. G Locrian is a practical choice for guitarists working in the 3rd position and appears in jazz whenever a Gm7♭5 chord functions in a ii–V–i progression in F minor. Its four flats keep it moderately complex on the page but straightforward in the fingers once the patterns are internalised.

What Makes Locrian Different?

The Locrian mode is built on the 7th degree of a major scale. G Locrian uses the notes of A♭ major starting and ending on G. Compared to G natural minor (G Aeolian), Locrian has both a flatted 2nd and a flatted 5th. Those two alterations eliminate the perfect 5th and produce a diminished tonic triad — making Locrian inherently unstable and unsuitable as a conventional key centre.

For a full explanation of all seven modes, see Modes Explained: Dorian to Locrian.

Notes of the G Locrian Scale

The G Locrian scale contains seven notes:

G – A♭ – B♭ – C – D♭ – E♭ – F

The scale follows the Locrian interval pattern — H – W – W – H – W – W – W — and returns to G one octave higher. It contains four flats (A♭, B♭, D♭, and E♭).

The half steps fall between G–A♭ (degrees 1–2) and C–D♭ (degrees 4–5). The minor 2nd (A♭) and diminished 5th (D♭) are the defining intervals — together they create the grinding, unstable tension that characterises Locrian.

G Locrian on Piano

G Locrian begins on G and immediately steps to A♭ — a black key — establishing the Locrian sound from the very first interval. With four black keys in the scale, the hand position alternates frequently between white and black keys.

Right hand fingering (ascending): 1 – 2 – 3 – 1 – 2 – 3 – 4 – 5 (thumb crosses under after B♭, then fingers walk up to G)

Left hand fingering (ascending): 5 – 4 – 3 – 2 – 1 – 3 – 2 – 1 (after the thumb plays C, the third finger crosses over to D♭)

Practise with a sustained G drone in your left hand. Without it, your ear will gravitate towards hearing A♭ major. The drone anchors G as the tonal centre and reveals the true Locrian darkness.

G Locrian on Guitar

On guitar, G Locrian sits in the 3rd position when rooted on the 6th string. This provides comfortable access to the characteristic Locrian intervals in the low register.

3rd position (low to high):

The half step between frets 3 and 4 on the low E string (G to A♭) is the source of Locrian’s menacing character. Metal guitarists exploit this ♭2-to-root motion for grinding, chromatic riffs.

Use the guitar fretboard view in the Interactive Chord Finder to see all positions at once.

Diatonic Chords in G Locrian

Stacking thirds on each scale degree produces seven triads with a characteristic Locrian pattern:

The i° chord (Gdim) is diminished — there is no stable tonic triad. Locrian establishes its root through rhythmic repetition and pedal tones rather than harmonic resolution.

For a thorough explanation of how diatonic chords are constructed, see Diatonic Chords: A Beginner’s Guide.

Seventh Chords

Adding a fourth note to each triad creates seventh chords, central to Locrian’s role in jazz:

The iø7 chord (Gm7♭5) is the half-diminished seventh — the chord most associated with Locrian. In jazz, when you see a Gm7♭5 chord, Locrian is the default scale choice. For more on seventh chords, see Seventh Chords: The Complete Guide.

Locrian in Practice

Because the tonic chord is diminished, traditional chord progressions do not work in Locrian. Instead, Locrian is used in specific contexts:

Metal Riffs and Ostinatos

In extreme metal, djent, and progressive metal, Locrian riffs use the ♭2–root half-step motion (A♭–G) as a grinding, dissonant motif. The riff anchors G through rhythmic repetition rather than harmonic resolution. The 3rd-fret position on guitar provides a solid low-register foundation for Locrian riffing.

Jazz Over Half-Diminished Chords

In jazz, G Locrian appears whenever a Gm7♭5 chord functions as a ii chord in a minor key. In a ii–V–i progression in F minor (Gm7♭5 – C7 – Fm), the Gm7♭5 chord calls for G Locrian. The scale is played over that single chord, not sustained as a key centre.

Experimental and Avant-Garde

Composers seeking maximum dissonance and instability turn to Locrian for its refusal to resolve. Film scores, video game soundtracks, and avant-garde compositions use it to create dread and unease.

Parent Major Scale and Modal Relationships

G Locrian is the 7th mode of A♭ major. Every mode of A♭ major shares the same seven notes but starts on a different degree:

Locrian vs Natural Minor

Locrian can be understood as a natural minor scale with two additional alterations — a flatted 2nd and a flatted 5th:

Those two semitone drops — A to A♭ and D to D♭ — remove the only intervals that give natural minor its stability. The result is a mode that cannot settle, cannot resolve, and constantly pulls away from its own root.

Practice Tips

Drone on G. Play or loop a low G note and improvise using the scale over it. Without the drone, your ear will default to hearing A♭ major.

Emphasise the ♭2 and ♭5. When practising, linger on A♭ (the minor 2nd) and D♭ (the diminished 5th). These are the notes that define Locrian.

Practise the ♭2–root riff. Repeatedly play A♭–G in rhythm. This half-step grind is the foundation of most Locrian riffs in metal.

Play over a Gm7♭5 chord. Loop a Gm7♭5 chord and improvise with the scale. This is the most practical jazz application.

Compare with Phrygian. Play G Phrygian (G – A♭ – B♭ – C – D – E♭ – F) immediately after G Locrian to hear the effect of the ♭5. Phrygian shares the ♭2 but keeps the perfect 5th — the comparison isolates exactly what the diminished 5th contributes to the Locrian sound.

Try It Yourself

Open the Interactive Chord Finder, select G as the root and Locrian as the scale. You will see every note highlighted on the piano keyboard or guitar fretboard, the step pattern visualised as intervals, and all diatonic chords laid out in a table — ready to play and explore.

For the complete list of scales in every key, see Scales for Piano and Guitar: The Complete Reference Guide.