The Locrian mode is the 7th mode of the major scale. The locrian mode contains the following ‘lowered’ or ‘flattened’ notes:
2, 3, 5, 6, 7
The locrian mode is quite a dark sounding mode. It is used often over half diminished chords, because it contains a flat 3, flat 5 and flat 7. We are not going to go into too much detail in this post regarding its sound and its use in musical contexts. What we will explore here is what the mode is and how to construct it.