B Locrian
A Locrian scale is when you play from the 7th degree of the major scale to an octave above, so for B Locrian, the notes are:

• B C D E F G A B

Each mode has an associated chord that is comprised of the 1st, 3rd, 5th and 7th degrees of the mode. For B Locrian, this chord is an B Minor 7b5 and the notes it contains are:

• B Minor 7b5: B D F A

In the example below, the following can be heard in order:

• The notes of the mode B Locrian
• The notes of the characteristic chord: B Minor 7b5
• A sample solo line using the notes of the B Locrian scale