Playing, Part 2 · Chapter 12: More Chords and Inversions

Minor Seventh (With Flatted Fifth) Chords and Inversions

If we flat the 5th of the minor 7th chord, we get another useful chord, which is called… you guessed it… a minor 7♭5 chord:

All About Piano — figure from page 73
Note the new diminished 5th interval description on the previous page. When we take a perfect interval (such as a 5th) and reduce it by a half step, we get a diminished interval.
The “minor 7th ♭5” chord is also referred to as a half diminished or half diminished 7th chord.

We can invert the C minor 7th ♭5 chord, as follows:

musical example
Minor Seventh (With Flatted Fifth) Chords and Inversions | MuseScore.com