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In most genres of popular music, including jazz, pop, and rock, a chord name and its corresponding symbol typically indicate one or more of the following: the root note (e.g. C ♯) the chord quality (e.g. minor or lowercase m, or the symbols o or + for diminished and augmented chords, respectively; chord quality is usually omitted for major ...
The diminished seventh chord is a four-note chord (a seventh chord) composed of a root note, together with a minor third, a diminished fifth, and a diminished seventh above the root: (1, ♭ 3, ♭ 5, 7). For example, the diminished seventh chord built on B, commonly written as B o 7, has pitches B-D-F-A ♭:
Diminished Diminished seventh chord (leading-tone and secondary chord) ... Altered chord; Approach chord; Chord names and symbols (popular music) Chromatic mediant;
Diminished chord function is rarer but still exists. Half-diminished chords can function in the same way as fully diminished chords, such as in the chord progression CM 7 – C ♯ dim 7 – Dm 7, or Em 7 – E ♭ dim 7 – Dm 7, where the diminished chord serves as a chromatic passing chord preceding a chord with a diatonic
A half-diminished seventh chord is a seventh chord built from the seventh degree of a major scale. 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 ...
o or dim indicates a diminished chord, either a diminished triad or a diminished seventh chord (d is not used). ø indicates a half-diminished seventh chord. In some fake books, the abbreviation m 7(♭ 5) is used as an equivalent symbol. 2 is mostly used as an extra note in a chord (e.g., add2, sus2).
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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: