The Locrian Mode has a…Limited But Useful Purpose

If your improvising over the dominant chord in the key it comes from the locrian mode would be useful. In other words in the key of C it will work over the G7 chord adding a 9th tone to the 7th.

You can of course use it to improvise over the minor 7th flat 5 chord it came from but you don’t see them too often.

B Locrian Notation/Tab

Here’s a sample of how it sounds played against a Bm7♭5

The B Locrian played against a B minor 7th flat 5 chord

The Locrian List

Here you go 1-♭2-♭3-4-♭5-♭6-♭7

For me this would be a hard one to remember this way I just think of the last note of the major scale.