Explore scales · Ukulele
A locrian scale on ukulele
A locrian uses A, B♭, C, D, E♭, F, G. Its half-step start and flattened fifth sit awkwardly on reentrant strings.
How it is built
Formula 1, ♭2, ♭3, 4, ♭5, ♭6, ♭7
How do you play the A locrian scale on ukulele?
A locrian in box 1 runs from fret 0 to fret 3, 11 notes across 4 strings, from C on the C string at fret 0 up to C on the A string at fret 3. The root falls on the G string at fret 2 and the A string at fret 0.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (G) | 0, 2, 3 | G, A, B♭ |
| 3 (C) | 0, 2, 3 | C, D, E♭ |
| 2 (E) | 1, 3 | F, G |
| 1 (A) | 0, 1, 3 | A, B♭, C |
Box 2 · frets 2–5
A locrian in box 2 runs from fret 2 to fret 5, 10 notes across 4 strings, from D on the C string at fret 2 up to D on the A string at fret 5. The root falls on the G string at fret 2 and the E string at fret 5.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (G) | 2, 3, 5 | A, B♭, C |
| 3 (C) | 2, 3, 5 | D, E♭, F |
| 2 (E) | 3, 5 | G, A |
| 1 (A) | 3, 5 | C, D |
Box 3 · frets 5–8
A locrian in box 3 runs from fret 5 to fret 8, 11 notes across 4 strings, from F on the C string at fret 5 up to F on the A string at fret 8. The root falls on the E string at fret 5.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (G) | 5, 7, 8 | C, D, E♭ |
| 3 (C) | 5, 7 | F, G |
| 2 (E) | 5, 6, 8 | A, B♭, C |
| 1 (A) | 5, 6, 8 | D, E♭, F |
Box 4 · frets 7–10
A locrian in box 4 runs from fret 7 to fret 10, 10 notes across 4 strings, from G on the C string at fret 7 up to G on the A string at fret 10. The root falls on the C string at fret 9.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (G) | 7, 8, 10 | D, E♭, F |
| 3 (C) | 7, 9, 10 | G, A, B♭ |
| 2 (E) | 8, 10 | C, D |
| 1 (A) | 8, 10 | F, G |
Box 5 · frets 9–12
A locrian in box 5 runs from fret 9 to fret 12, 9 notes across 4 strings, from A on the C string at fret 9 up to A on the A string at fret 12. The root falls on the C string at fret 9 and the A string at fret 12.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (G) | 10, 12 | F, G |
| 3 (C) | 9, 10, 12 | A, B♭, C |
| 2 (E) | 10, 11 | D, E♭ |
| 1 (A) | 10, 12 | G, A |
Why it sounds like that
A locrian is the seventh mode of B♭ major, built as 1, ♭2, ♭3, 4, ♭5, ♭6, ♭7. It lowers the fifth of A phrygian, producing a diminished tonic triad. The scale’s half-step opening and tritone against the root create its unstable colour.
When to use it
Use A locrian over A minor 7th flat 5th or A diminished chords in minor-key turnarounds. It suits tense jazz passages and metal riffs that need a half-step lead-in. Try it over A minor 7th flat 5th or A diminished.
Which position to practise
Learn Box 1 first. It places the root on strings 4 and 2 and covers frets 0–3 for quick low-position runs.
Common questions
Which notes are in A locrian?
A, B♭, C, D, E♭, F, and G. The scale has a half step between A and B♭, and a tritone between A and E♭. It is the seventh mode of B♭ major.
What chords fit A locrian?
A minor 7th flat 5th and A diminished are the primary chords. The scale also works over B♭ major and C minor in passing. Use it where the harmony implies a diminished tonic.
Why does A locrian sound unstable?
The flattened fifth creates a tritone with the root. Combined with the flattened second, the scale lacks a perfect fifth. This makes it hard to resolve and gives a dark, tense quality.