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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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Added tone chord notation is useful with seventh chords to indicate partial extended chords, for example, C 7add 13, which indicates that the 13th is added to the 7th, but without the 9th and 11th. The use of 2, 4, and 6 rather than 9, 11, and 13 indicates that the chord does not include a seventh unless explicitly specified.
However, in most popular-music chord books, the symbol "dim" or "o" represents a diminished seventh chord (a four-tone chord), which in some modern jazz books and music theory books is represented by the "dim7" or "o 7" symbols. For example, the diminished triad built on B, written as B o, has pitches B-D-F:
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 ...
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.
In some jazz tunes, all or almost all of the chords that are used are dominant chords. For example, in the standard jazz chord progression ii–V–I, which would normally be Dm–G 7 –C in the key of C major, some tunes will use D 7 –G 7 –C 7. Since jazz tunes are often based on the circle of fifths, this creates long sequences of ...