Gb Locrian Mode: Notes, Chords and How to Play It

Gb Locrian is one of the darkest, most restless sounds you can pull out of a guitar. It's the seventh mode of the major scale. A mode is simply a scale you get by starting a familiar set of notes from a different home note. Locrian is famous for refusing to settle down, which makes it a great colour for tense, eerie riffs. In this key it also comes with an unusual spelling, so let's clear that up first and then get it under your fingers.

A Friendly Word About the Spelling

When you look at the notes below, you'll see things like Abb and Dbb. That "bb" is a double flat. A single flat lowers a note by one fret. A double flat lowers it by two frets. So Dbb means "take D and drop it two frets."

Gb Locrian is what musicians call a theoretical key. It's perfectly correct on paper, but it needs double flats to spell properly, so almost nobody writes music in it. In real life, players use F# Locrian instead, which has a key signature of just 1 sharp. Here's the reassuring part: F# Locrian sounds exactly the same. Same frets, same sound, different names. If you ever see a chart, it will almost certainly say F# Locrian.

So why spell it this way at all? Because every scale uses each letter name once, in order. Starting on Gb, the letters must run G, A, B, C, D, E, F, and the flats fall where they need to fall to keep the pattern of steps correct.

The Notes and Where They Come From

The notes of Gb Locrian are: Gb, Abb, Bbb, Cb, Dbb, Ebb, Fb.

Every scale is built from a pattern of steps. A half step (H) is the distance of one fret. A whole step (W) is two frets. The Locrian pattern is:

H - W - W - H - W - W - W

Starting on Gb, follow it through:

• Gb to Abb: half step (1 fret)
• Abb to Bbb: whole step (2 frets)
• Bbb to Cb: whole step
• Cb to Dbb: half step
• Dbb to Ebb: whole step
• Ebb to Fb: whole step
• Fb back to Gb: whole step

Compared with a regular major scale, the formula is 1, b2, b3, 4, b5, b6, b7. In plain words, almost everything is lowered: a minor 2nd, a minor 3rd, a diminished (flattened) 5th, a minor 6th and a minor 7th. Only the 4th stays "perfect."

Locrian shares its notes with a major scale, called its parent. Here that's Abb major (Abb, Bbb, Cb, Dbb, Ebb, Fb, Gb), which on paper needs 11 flats. Same notes, but Gb Locrian starts and resolves on Gb.

Why It Sounds So Unsettled

Most scales have a solid perfect 5th above the root. It's the note that makes a chord feel grounded, like the legs of a table. Locrian takes that leg and shortens it. Its defining note is the flat 5th, and in this key that note is Dbb.

Because of that flat 5th, the chord built on the root is diminished rather than major or minor. A diminished chord sounds tight and suspenseful, like a question that never gets answered. That's why Locrian always feels as if it's leaning somewhere else.

What to listen for: play Gb, then Dbb together or one after the other. That uneasy, grinding sound is the heart of Locrian. The b2 (Abb), just one fret above the root, adds an extra shot of menace. You'll hear this kind of half-step-and-flat-5th sound a lot in heavy, dark metal riffing.

The Chords of Gb Locrian

Stack every other note of the scale and you get these chords:

• i°: Gbdim (Gb-Bbb-Dbb) / Gbm7b5
• bII: Abb (Abb-Cb-Ebb) / Abbmaj7
• biii: Bbbm (Bbb-Dbb-Fb) / Bbbm7
• iv: Cbm (Cb-Ebb-Gb) / Cbm7
• bV: Dbb (Dbb-Fb-Abb) / Dbbmaj7
• bVI: Ebb (Ebb-Gb-Bbb) / Ebb7
• bvii: Fbm (Fb-Abb-Cb) / Fbm7

A Simple Progression to Jam Over

The trick with Locrian is to keep coming back to the root chord so your ear knows where home is, even if home is uneasy. Try:

Gbm7b5 - Abbmaj7 - Gbm7b5 - Cbm7

Give each chord a bar. The move from the root up a half step to Abbmaj7 is the classic Locrian gesture: dark, then strangely bright, then back into the shadows. Record it, loop it, and improvise with the scale over the top, landing on Gb and leaning on Dbb.

Finding the Root on the Neck

In standard tuning, your home note Gb sits here:

• Low E (6th) string: frets 2 and 14
• A (5th) string: frets 9 and 21

A great first exercise is to play the whole scale along one string so you can see the step pattern. On the low E string, start at fret 2 and follow H - W - W - H - W - W - W: frets 2, 3, 5, 7, 8, 10, 12, and 14. Say the note names out loud as you go. Then try building the scale across strings starting from fret 9 on the A string.

Your Practice for Today

Set a slow, steady beat and play a low riff that alternates the open low E string area around fret 2 with fret 3, the root and its menacing b2. Once that feels natural, add the flat 5th and let it ring. Ten minutes of that, then loop the progression above and noodle freely. Don't chase speed. Chase the mood, and let Locrian's tension do the work for you.

For the bigger picture, read The Locrian Mode.