piano scale
B Locrian
B1C♭2D♭3E4F♭5G♭6A♭7
The only mode of the major scale whose fifth is diminished, which is why its tonic chord cannot rest.
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
BHCWDWEHFWGWAWB
What is true of it
B Locrian is B, C, D, E, F, G and A, and back to B.
Its steps are H – W – W – H – W – W – W, where W is a whole step and H a half.
It uses no sharps and no flats at all: seven letters, seven white keys.
On the same tonic, B Phrygian differs from it by exactly one note.
Chords made only of these notes
Found by testing every chord in the catalogue against these 7 sounds, not chosen.