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Piano scale
B♭ Locrian Scale
The darkest mode — diminished tonic, ♭2 and ♭5. Rare but striking.
On the keyboard
Green marks the root. Fingering is shown for the major scales, where the standard is settled; for this scale teachers genuinely differ, so start from the major-scale fingering in the same key and adjust to your hand.
The notes
B♭1
C♭♭2
D♭♭3
E♭4
F♭♭5
G♭♭6
A♭♭7
The chords inside it
Stack every other note of the scale and these seven chords fall out. Nobody chose them — they are a consequence of the spacing. Tap one to hear it.