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Half-Diminished Seventh Chords (Min7♭5)

Half-diminished seventh chords create a darker, more complex tension than regular minor seventh chords. They're commonly found in jazz and classical music, particularly in minor key progressions.

Structure​

A half-diminished seventh chord consists of:

  • Root - The fundamental note that gives the chord its name
  • Minor Third - 3 semitones above the root
  • Diminished Fifth - 6 semitones above the root
  • Minor Seventh - 10 semitones above the root

Example: C Half-Diminished Seventh​

The C half-diminished seventh chord contains the notes C - E♭ - G♭ - B♭:

  • C (Root)
  • E♭ (Minor Third - 3 semitones from C)
  • G♭ (Diminished Fifth - 6 semitones from C)
  • B♭ (Minor Seventh - 10 semitones from C)

Sound Characteristics​

  • Mood: Dark, sophisticated, yearning
  • Symbol: Cm7♭5, CØ7, C-7♭5

Half-diminished chords are often found as the ii° chord in minor keys and are essential for jazz harmony. They provide a darker alternative to regular minor seventh chords and create smooth voice leading in sophisticated progressions.