piano scale
B altered
B1C♭2D♭3E♭♭4F♭5G♭6A♭7
The seventh mode of melodic minor. Every degree above the tonic that can be altered, is.
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
BHCWDHE♭WFWGWAWB
What is true of it
B altered is B, C, D, E♭, F, G and A, and back to B.
Its steps are H – W – H – W – W – W – W, where W is a whole step and H a half.
On the same tonic, B Locrian 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.