Cb Locrian Mode: Notes, Chords and How to Play It
Cb Locrian is the darkest and most restless of the seven modes, written in one of the most unusual keys you'll ever see on paper. Don't let the spelling scare you off. Under all those flats sits a sound you can play right now, and learning it will train your ear to hear tension, the ingredient that makes music feel like it's going somewhere. Let's take it apart piece by piece.
The Notes of Cb Locrian
A scale is a set of notes played in order, and a mode is a scale heard from a particular starting note. Here are the seven notes of Cb Locrian:
Cb, Dbb, Ebb, Fb, Gbb, Abb, Bbb
Yes, that's a lot of flats, and some of them are double flats (bb), which means the note is lowered by two frets instead of one. We'll come back to why in a moment. For now, the important thing is that every note gets its own letter name, A through G, used exactly once. That's the rule that forces these odd spellings.
Musicians describe each note by its distance from the root, the home note. In Locrian that formula is: 1 (root), b2 (minor 2nd), b3 (minor 3rd), 4 (perfect 4th), b5 (diminished 5th), b6 (minor 6th), b7 (minor 7th). Almost everything is lowered compared with a major scale, and that's why the mode sounds so shadowy.
Building It From the Step Pattern
On guitar, a half step (H) is the distance of one fret, and a whole step (W) is two frets. Locrian follows this pattern:
H - W - W - H - W - W - W
- Start on Cb.
- Up a half step to Dbb.
- Up a whole step to Ebb.
- Up a whole step to Fb.
- Up a half step to Gbb.
- Up a whole step to Abb.
- Up a whole step to Bbb.
- Up a whole step and you're back to Cb.
Try it on a single string: pick a fret, then move up 1, 2, 2, 1, 2, 2, 2 frets. Playing it along one string is a great way to feel the shape of the mode before you worry about patterns.
A Friendly Word About That Spelling
Cb Locrian is what's called a theoretical key. Its parent major scale, Dbb major (Dbb, Ebb, Fb, Gbb, Abb, Bbb, Cb), would need a key signature of 12 flats, which is more flats than there are notes. Nobody actually writes music that way.
Here's the reassuring part: Cb is the same pitch as B on your guitar. So in practice, musicians write this as B Locrian, which has no sharps or flats at all and sounds exactly the same. Your fingers play identical frets either way. Think of Cb Locrian as the same song with a more complicated name tag. If you ever see a chart, it'll almost certainly say B Locrian.
What Gives Locrian Its Sound
Locrian shares its notes with Dbb major, but it starts and resolves on Cb. Changing the home note changes the whole mood.
The special ingredient is the flat 5th, which in this key is Gbb. Most scales have a perfect 5th, a solid, stable note that makes the root feel grounded. Locrian lowers it by a fret, and suddenly the floor tilts. That's why the chord built on the root is diminished, a tight, tense chord that never quite feels at rest.
When you play the mode, linger on Gbb against the root. Listen for that uneasy, almost suspenseful pull. That's Locrian talking. The b2, Dbb, sitting just one fret above the root, adds to the sense that home is a slightly uncomfortable place to be.
Chords From Cb Locrian
Stack every other note of the scale and you get these chords (triad first, then the fuller seventh chord):
- i°: Cbdim (Cb-Ebb-Gbb) / Cbm7b5
- bII: Dbb (Dbb-Fb-Abb) / Dbbmaj7
- biii: Ebbm (Ebb-Gbb-Bbb) / Ebbm7
- iv: Fbm (Fb-Abb-Cb) / Fbm7
- bV: Gbb (Gbb-Bbb-Dbb) / Gbbmaj7
- bVI: Abb (Abb-Cb-Ebb) / Abb7
- bvii: Bbbm (Bbb-Dbb-Fb) / Bbbm7
A Simple Progression to Jam Over
Locrian is tricky to keep in focus because your ear wants to drift to a more stable chord. The trick is to keep returning to the root chord. Try this, two beats or one bar each:
Cbm7b5 | Dbbmaj7 | Cbm7b5 | Bbbm7
The move from Cbm7b5 up to Dbbmaj7 is the signature Locrian sound: that half-step lift from root to b2. Loop it, record it, and improvise over it using the mode's notes, always landing back on Cb.
Finding the Root on the Neck
On a standard-tuned six-string guitar, your Cb root lives here:
- Low E (6th) string: frets 7 and 19
- A (5th) string: frets 2 and 14
The 7th fret on the low E string is a comfortable home base. From there, your b2 (Dbb) is just one fret up at the 8th fret. On the A string, start at the 2nd fret and you'll find the flat 5th, Gbb, six frets higher at the 8th fret, or across on the D string at the 3rd fret. Getting to know where that b5 sits relative to the root is the fastest way to make the mode your own.
Your Practice Plan
Spend five minutes today playing the mode slowly up and down one string from the 7th fret of the low E. Then put on your loop of Cbm7b5 to Dbbmaj7 and play just three notes over it: Cb, Dbb and Gbb. Let each one ring and really listen to the tension. Once that sound feels familiar, add the other notes one at a time. Before long, that unsettled Locrian colour will be a tool you reach for on purpose.
For the bigger picture, read The Locrian Mode.