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The half-diminished seventh chord is frequently used in passages that convey heightened emotion. For example, the "mournful affect" [5] of the sombre opening Chorus of J. S. Bach's St Matthew Passion (1727) features the chord on the seventh beat of its first bar and on the first beat of its third bar:
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Half-diminished seventh chord on C (Play ⓘ). A diminished triad with a minor seventh is a half-diminished chord, usually notated either Cm 7(♭ 5) or C ø7. A diminished triad played over a root a major third away creates a Dominant 7th chord, notated C 7, with a C Major triad on the bottom, and an E° from the chord third of C (C E G B ...
Chord qualities are related to the qualities of the component intervals that define the chord. The main chord qualities are: Major and minor; Augmented, diminished, and half-diminished; Dominant; Some of the symbols used for chord quality are similar to those used for interval quality: No symbol, or sometimes M or Maj for major; m, or min for minor
It is considered "half-diminished" because a fully diminished seventh has a double-flatted (diminished) seventh, making it enharmonically the same as a major sixth. The half-diminished seventh chord uses a minor seventh over the root of a diminished triad. Example: (in the key of C major) B–D–F–A.
The half-diminished seventh chord contains the same tritone, while the fully diminished seventh chord is made up of two superposed tritones a minor third apart. Other chords built on these, such as ninth chords, often include tritones (as diminished fifths).
The leading-tone seventh chords are vii ø 7 and vii o 7, [24] the half-diminished and diminished seventh chords on the seventh scale degree of the major and harmonic minor. For example, in C major and C minor, the leading-tone seventh chords are B half-diminished (B–D–F–A) and B diminished (B–D–F–A ♭), respectively.
Allen first identifies the chord as an atonal set, 4–27 (half-diminished seventh chord), then "elect[s] to place that consideration in a secondary, even tertiary position compared to the most dynamic aspect of the opening music, which is clearly the large-scale ascending motion that develops in the upper voice, in its entirety a linear ...