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  2. Diminished seventh chord - Wikipedia

    en.wikipedia.org/wiki/Diminished_seventh_chord

    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 ♭:

  3. Modulation (music) - Wikipedia

    en.wikipedia.org/wiki/Modulation_(music)

    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 ...

  4. Common tone (chord) - Wikipedia

    en.wikipedia.org/wiki/Common_tone_(chord)

    A diminished seventh chord may resolve to a chord whose root is common to both chords (e.g. ♯ ii o 7 resolves to I 6). When this happens, the first chord is called a common-tone diminished seventh chord.

  5. Tritone - Wikipedia

    en.wikipedia.org/wiki/Tritone

    In that system (which is the fundamental musical grammar of Baroque and Classical music), the tritone is one of the defining intervals of the dominant-seventh chord and two tritones separated by a minor third give the fully diminished seventh chord its characteristic sound.

  6. Seventh chord - Wikipedia

    en.wikipedia.org/wiki/Seventh_chord

    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 ...

  7. Chord notation - Wikipedia

    en.wikipedia.org/wiki/Chord_notation

    Ninth chords are built by adding a ninth to a seventh chord, either a major ninth [M9] or a minor ninth [m9]. A ninth chord includes the seventh; without the seventh, the chord is not an extended chord but an added tone chord—in this case, an add 9. Ninths can be added to any chord but are most commonly seen with major, minor, and dominant ...

  8. Secondary chord - Wikipedia

    en.wikipedia.org/wiki/Secondary_chord

    If it is major, the leading-tone chord may be either half-diminished or fully diminished, though fully diminished chords are used more often. [24] Because of their symmetry, secondary leading-tone diminished seventh chords are also useful for modulation; all four notes may be considered the root of any diminished

  9. Diminished major seventh chord - Wikipedia

    en.wikipedia.org/wiki/Diminished_major_seventh_chord

    Diminished major seventh chords are very dissonant, containing the dissonant intervals of the tritone and the major seventh.They are frequently encountered, especially in jazz, as a diminished seventh chord with an appoggiatura [citation needed], especially when the melody has the leading note of the given chord: the ability to resolve this dissonance smoothly to a diatonic triad with the same ...