The B♭ Phrygian scale contains seven notes: B♭, C♭, D♭, E♭, F, G♭, and A♭. It follows the whole-step / half-step pattern H-W-W-W-H-W-W.
B♭ Phrygian Mode Notes
| Degree | Name | Note | Interval |
|---|---|---|---|
| 1 | Tonic | B♭ | P1 |
| ♭2 | Supertonic | C♭ | m2 |
| ♭3 | Mediant | D♭ | m3 |
| 4 | Subdominant | E♭ | P4 |
| 5 | Dominant | F | P5 |
| ♭6 | Submediant | G♭ | m6 |
| ♭7 | Leading Tone | A♭ | m7 |
Key Signature
The B♭ Phrygian Mode draws its notes from Gb Major, so it is written with that key signature: 6 flats (B♭, E♭, A♭, D♭, G♭, C♭).
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
Mnemonic: Battle Ends And Down Goes Charles’ Father
Diatonic Chords in the B♭ Phrygian Mode
These are the triads built on each degree of the B♭ Phrygian Mode:
How Phrygian Relates to the Major Scale
B♭ Phrygian uses the same notes as F♯ Major
Common Tones
Common tones are the notes that two scales or modes share. Knowing which notes the B♭ mode shares with its parallel modes (same root, different scale) helps with improvisation, modal interchange, and smooth voice leading. The more notes two modes share, the more closely related they sound — and the easier it is to slide between them in a solo or progression.
| Parallel Mode | Common Notes | Shared / 7 |
|---|---|---|
| B♭ Dorian | B♭ – C♭ – D♭ – E♭ – F – G♭ – A♭ – B♭ | 8 / 7 |
| B♭ Lydian | B♭ – C♭ – D♭ – E♭ – F – G♭ – A♭ – B♭ | 8 / 7 |
| B♭ Mixolydian | B♭ – C♭ – D♭ – E♭ – F – G♭ – A♭ – B♭ | 8 / 7 |
| B♭ Locrian | B♭ – C♭ – D♭ – E♭ – F – G♭ – A♭ – B♭ | 8 / 7 |
| B♭ Ionian | B♭ – C♭ – D♭ – E♭ – F – G♭ – A♭ | 7 / 7 |
| B♭ Aeolian | B♭ – C♭ – D♭ – E♭ | 4 / 7 |