Bb Locrian Mode

What is the Bb Locrian Mode?

Locrian is the seventh and darkest mode of the major scale, with both a ♭2 and a ♭5 that produce a diminished tonic triad — making it inherently unstable and restless. It's rarely used as a tonal center in traditional music, but metal and progressive players lean into that instability for intense, dissonant passages. Here's how the Bb Locrian Mode lays out on the fretboard. This scale is enharmonically equivalent to A# Locrian.

Notes and Positions

The seventh mode - the darkest diatonic mode with a flat 5th. On guitar, the same scale tones repeat in multiple positions, so the real goal is learning how to connect shapes up and down the neck. Use the CAGED boxes as smaller practice areas before linking the full fretboard. In the key of Bb, the notes are: Bb, Cb, Db, Eb, Fb, Gb, Ab.

How to Use It

You'll often hear it in Metal, Jazz, and Modal. A good way to internalize the sound is to sing the root, then sing a few scale degrees before you play them.

Loop a simple backing track in the same key and target the root on strong beats. Use the interactive fretboard above to spot repeats of the same note on different strings and frets.