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B♭ phrygian scale on bass guitar
B♭ Phrygian uses B♭, C♭, D♭, E♭, F, G♭, A♭. Box 1 anchors the root on string 3, fret 1 for a mid-neck start.
How it is built
Formula 1, ♭2, ♭3, 4, 5, ♭6, ♭7
How do you play the B♭ phrygian scale on bass?
B♭ phrygian in box 1 runs from fret 1 to fret 4, 12 notes across 4 strings, from F on the E string at fret 1 up to C♭ on the G string at fret 4. The root falls on the A string at fret 1 and the G string at fret 3.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (E) | 1, 2, 4 | F, G♭, A♭ |
| 3 (A) | 1, 2, 4 | B♭, C♭, D♭ |
| 2 (D) | 1, 3, 4 | E♭, F, G♭ |
| 1 (G) | 1, 3, 4 | A♭, B♭, C♭ |
Box 2 · frets 4–7
B♭ phrygian in box 2 runs from fret 4 to fret 7, 9 notes across 4 strings, from A♭ on the E string at fret 4 up to D♭ on the G string at fret 6. The root falls on the E string at fret 6.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (E) | 4, 6, 7 | A♭, B♭, C♭ |
| 3 (A) | 4, 6 | D♭, E♭ |
| 2 (D) | 4, 6 | G♭, A♭ |
| 1 (G) | 4, 6 | C♭, D♭ |
Box 3 · frets 6–9
B♭ phrygian in box 3 runs from fret 6 to fret 9, 11 notes across 4 strings, from B♭ on the E string at fret 6 up to E♭ on the G string at fret 8. The root falls on the E string at fret 6 and the D string at fret 8.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (E) | 6, 7, 9 | B♭, C♭, D♭ |
| 3 (A) | 6, 8, 9 | E♭, F, G♭ |
| 2 (D) | 6, 8, 9 | A♭, B♭, C♭ |
| 1 (G) | 6, 8 | D♭, E♭ |
Box 4 · frets 9–11
B♭ phrygian in box 4 runs from fret 9 to fret 11, 8 notes across 4 strings, from D♭ on the E string at fret 9 up to G♭ on the G string at fret 11. No root falls inside this box; it sits between two of them.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (E) | 9, 11 | D♭, E♭ |
| 3 (A) | 9, 11 | G♭, A♭ |
| 2 (D) | 9, 11 | C♭, D♭ |
| 1 (G) | 10, 11 | F, G♭ |
Box 5 · frets 11–14
B♭ phrygian in box 5 runs from fret 11 to fret 14, 10 notes across 4 strings, from E♭ on the E string at fret 11 up to A♭ on the G string at fret 13. The root falls on the A string at fret 13.
Every note in this box, string by string
| String | Frets | Notes |
|---|---|---|
| 4 (E) | 11, 13, 14 | E♭, F, G♭ |
| 3 (A) | 11, 13, 14 | A♭, B♭, C♭ |
| 2 (D) | 11, 13 | D♭, E♭ |
| 1 (G) | 11, 13 | G♭, A♭ |
Why it sounds like that
B♭ Phrygian lowers the second degree of B♭ natural minor by a half step. The resulting ♭2 interval creates a dark, tense sound. Compare it with B♭ natural minor to hear the difference.
When to use it
Use B♭ Phrygian over B♭ minor and B♭ 5th chords. The ♭2 adds a Spanish or metal flavor. It fits flamenco, metal, and dark ambient styles. Try it over B♭ minor or B♭ 5th.
Which position to practise
Practice Box 1 first. It places the root on string 3, fret 1, covering frets 1–4 for a mid-neck position.
Common questions
What notes are in B♭ Phrygian?
B♭ Phrygian contains B♭, C♭, D♭, E♭, F, G♭, and A♭. The C♭ is the flat second that defines the mode. All other notes match B♭ natural minor. It is also spelled A♯ in enharmonic notation for the same sounding root.
Which chords fit B♭ Phrygian?
B♭ minor and B♭ 5th chords fit best. The scale also works over progressions using B major, C♯ major, E♭ minor, F diminished, F♯ major, and A♭ minor. The flat second adds tension over the tonic.
What is the difference between B♭ Phrygian and B♭ natural minor?
B♭ Phrygian has a C♭ instead of C. This single half-step change creates the Phrygian sound. The rest of the notes are identical.