B Locrian, Mapped for the Guitar

B Locrian runs 7 notes to the octave, laid across this seat's EADGBE fretboard with every B marked. A blues phrase is short and keeps coming home to one pitch; the marked notes are where it comes home to.

The most dissonant, unstable mode — the tonic chord is diminished (b5), making a true Locrian tonal center rare. Used for color and passing harmony.

Heard in: Metal riffs, jazz (half-diminished ø7 chords in ii°7 – V – i), horror and tension film scores.

On the guitar a scale is mostly raw material for bends: a note a fret or two below the one you want, pushed up until it sounds right against the chord, which is how a fretted instrument reaches the pitches between its frets.

Whatever scale you start from, the blues bends it: the third and the seventh get pushed flat, or somewhere between flat and natural, and that pull against the chord underneath is most of what the idiom sounds like.