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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:
A diminished seventh chord consists of three superposed minor thirds, and thus has all successive notes a minor third apart; it contains two diminished fifths. In jazz theory, a diminished seventh chord has four available tensions, each a major ninth above the chord tones, and thus forming a diminished seventh chord a whole tone (or major ninth ...
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 is used quite readily in the minor key, where it is present in the harmonic minor scale between the seventh scale step and the sixth scale step in the octave above. In 12-tone equal temperament , a diminished seventh is equal to nine semitones, a ratio of 2 9/12 :1 (approximately 1.6818), or 900 cents, and is ...
In short, lowering any note of a diminished seventh chord by a half tone leads to a dominant seventh chord (or German sixth enharmonically), the lowered note being the root of the new chord. Raising any note of a diminished seventh chord by a half tone leads to a half-diminished seventh chord, the root of which is a whole step above the raised ...
For instance, the interval from C 4 to C 5 is a perfect octave, twelve semitones wide, and both the intervals from C ♯ 4 to C 5 and from C 4 to C ♭ 5 are diminished octaves, spanning eleven semitones. Being diminished, it is considered a dissonant interval. [3] The diminished octave is enharmonically equivalent to the major seventh.
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 ♭:
In modern Western tonal music theory, a diminished second is the interval produced by narrowing a minor second by one chromatic semitone. [1] In twelve-tone equal temperament, it is enharmonically equivalent to a perfect unison; [3] therefore, it is the interval between notes on two adjacent staff positions, or having adjacent note letters, altered in such a way that they have no pitch ...