B Locrian mode
B C D E F G A
Formula: 1 ♭2 ♭3 4 ♭5 ♭6 ♭7
The seventh mode, with a minor 2nd and a diminished 5th. It fits the half-diminished chord (m7♭5), the ii of a minor ii-V-i.
It has the same notes as C major, starting from B.
On the neck, frets 0 to 12
The 1st string (high e) is at the top, as in the app. The root is filled.
Open it in the app: 3. Scales & Modes, in B
The Locrian mode in other keys